Low blood sugar - how do you know?

how would you find out if you have low blood sugar?
i experience sickness in the morning as if i haven't eaten for days & as soon as i eat something it goes away. i have constant headaches, & my eating pattern is anything but normal, could marijuana make me feel worse?
how would i really know if i have low blood sugar?
my grandma had diabetes could that be passed on to me?

Here are the warning signs:

Frequent trips to the bathroom:

Are you visiting the bathroom much more lately? Does it seem like you urinate all day long? Urination becomes more frequent when there is too much glucose in the blood. If insulin is nonexistent or ineffective, the kidneys can't filter glucose back to the blood. They become overwhelmed and try to draw extra water out of the blood to dilute the glucose. This keeps your bladder full and it keeps you running to the bathroom.
Unquenchable Thirst:

If it feels like you can't get enough water and you're drinking much more than usual, it could be a sign of diabetes, especially if it seems to go hand in hand with frequent urination. If your body is pulling extra water out of your blood and you're running to the bathroom more, you will become dehydrated and feel the need to drink more to replace the water that you are losing.
Losing Weight Without Trying:

This symptom is more noticeable with Type 1 diabetes. In Type 1, the pancreas stops making insulin, possibly due to a viral attack on pancreas cells or because an autoimmune response makes the body attack the insulin producing cells. The body desperately looks for an energy source because the cells aren't getting glucose. It starts to break down muscle tissue and fat for energy. Type 2 happens gradually with increasing insulin resistance so weight loss is not as noticeable.
Weakness and Fatigue:

It's that bad boy glucose again. Glucose from the food we eat travels into the bloodstream where insulin is supposed to help it transition into the cells of our body. The cells use it to produce the energy we need to live. When the insulin isn't there or if the cells don't react to it anymore, then the glucose stays outside the cells in the bloodstream. The cells become energy starved and you feel tired and run down.
Tingling or Numbness in Your Hands, Legs or Feet:

This symptom is called neuropathy. It occurs gradually over time as consistently high glucose in the blood damages the nervous system, particularly in the extremities. Type 2 diabetes is a gradual onset, and people are often not aware that they have it. Therefore, blood sugar might have been high for more than a few years before a diagnosis is made. Nerve damage can creep up without our knowledge. Neuropathy can very often improve when tighter blood glucose control is achieved.
Other Signs and Symptoms That Can Occur:

Blurred vision, skin that is dry or itchy, frequent infections or cuts and bruises that take a long time to heal are also signs that something is amiss. Again, when these signs are associated with diabetes, they are the result of high glucose levels in the body. If you notice any of the above signs, schedule an appointment with your doctor. He or she will be able to tell you if you have reason to be concerned about a diagnosis of diabetes.

yea diabetes can be passed on but diet and exercise has alot to do with controling diabetes
you need to get tested first to see if you have it
read online about diabetes to give you some tips

I have low blood sugar, i started out with the headaches, shakes, etc. you should be tested. if you feel worse about an hour after eating a candy bar or something equivalent with a lot of sugar, your sugar went up and then crashed - peanut butter is good because you've got the protien factor - see an m.d. :)

hey im a diabetic and im type 1.. the symptoms are usually shaking and hunger and u will sweat a cold sweat... marijuana does make it worse trust me lol... get a blood sugar monitor if u want to make sure that ur sugar is low. and yes u could have gotten it from ur grandma. diabetes can be inherited

diabetes can be passed on to you but if you are old enough to be smoking pot then I would guess you would know by now if you are diabetic. listen, early signs are a shaking or nervous twitch in you hands. when you eat it goes away. smoking pot has nothing to do with diabetes.. Have your bsg aka a blood sugar check with your dr

Short and to the point,if U feel shaky and thristy when U first get up, and going to the bathroom more than u use to than U could possibly on the verge of be coming a diabetic.I have been one now for 17 years.and no mary jane will not make U feel worse.And yes diabetes can be passed on to U and also to ur children as they get older.Go to ur Dr and tell him how U feel when U first get up.

As A Diabetec you just know youd feel weak and the check by the machine and if under limit use insulin...happy days lol!!

Sounds like hypoglycemia...I have diabetes and when I'm low I #1 feel like I haven't eaten in days
#2 Get headaches
#3 start trembling
#4 My tongue and lips start to feel tingly

Diabetes can be passed on from your grandmother. It doesn't sound like you have diabetes...Maybe hypoglycemia. You should get your eating patterns normal and regular, but not too much. 3 meals a day and 3 snacks a day is my diet and I'm doing pretty good.

Good luck!

I feel shaky on the inside.