Hashimoto disease?

I recently found out that i have this. Two of my thyroid hormone are above normal. They said my left lobe is small. I am starting the medication tomorrow and I have a few questions:
1) Would i be able to make the disease go away and make my thyroid be normal?
2) How dangerous is this disease?
3) I think i got this disease since birth and i didn't have anything bad happen to me. Only my thyroid tissue seem bigger. I don't have any family history, so why do i have it?

I don't have this: http://www.nlm.nih.gov/medlineplus/ency/...
It only a little bigger towards the middle but not too big.

I was diagnosed with this several years ago and it is not a big deal. You are hypothyroid which actually means you thyroid hormone levels are actually LOW. The thing that is high is your TSH (thyroid stimulating hormone) which means your body keeps putting out the call for more thyroid hormone because you aren't making enough. The main symptom of this is that you get too tired too easilly and you can put on excess weight. They will adjust your hormone level with synthetic thyroid hormone and when your level is balanced you will return to a normal energy level and won't be extra likely to put on weight. The bad news is the condition is progressive, it will tend to get gradually worse for the rest of your life, the could news is that it tends to progress pretty slowly and is easilly managed. 5 years ago they started me on 75 micrograms and since then they have bumped me twice up to 100 micrograms, but I happen to know that they make pills ten times that strong, so I'm not really to worried. Also, even though it sucks that you will be on thyroid meds for the rest of your life, if you get the generic version of the medicine it is pretty cheap. If they accidentally get your level to high you might start to feel a little jittery like a too much coffee feeling, but it's no big deal, just tell your doctor and they will shave back your dose. They will probably take blood from you once every few months to double check your TSH levels. As for the causes, I don't know, maybe it's caused by a virus??? Good luck and don't sweat it.

To answer your questions:-
1) If you get Hashimotos thyroiditis in adolesence, there is apparently a chance of spontaneous remission (see link below).
2) It isn't a "dangerous" disease, although without treatment you would feel quite ill. The treatment (thyroxine) just replaces the thyroid hormone that your body would make if your thyroid was working correctly. You should notice a big improvement with the treatment.
3) Hashimoto's is an autoimmune disease, meaning that the body doesn't recognise your thyroid as being part of you. There are many, many other autoimmune diseases similar to this which affect other parts of the body. Although it HT can be hereditary, it is not fully known why some people get an autoimmune disease and others don't.
Try to get some reassurance from your physician just to put your mind at rest. Good luck.