Can you control some nerve impluses with any kind of medicne?

Im a bio major and Ive always had this problem dealing with blood and diseases. I usually strart getting all sweaty and I turn a pale white. Then I start feeling this tingly feeling and my eyes start seeing black patches then I usually pass out. I told this to one of my professors and they said that its a nerve that is sending these impluses and they keep getting stronger until I pass out. Im not sure how you spell the nerve but I believe it was called the Vegas nerve. Excuse my spelling but I want to know if their is any kind of medication I could take that dumbs this nerve down so when I have lectures or labs that deal with blood and diseases I wont have much of a problem. Any help would be appreciated.

It's the vagus nerve and you're having a vagal response with vaso-vagal syncope. Other taking than a very mild sedative before going into the stimulus environment, I would suggest desensitization. You may wish to discuss this with your primary care provider. A beta-blocker is used when the response is neurocardiogenic. But this type of response occurs spontaneously due to the particular mechanism causing it. Not because of seeing blood and disease.

Well it is a common problem and actually improves with time. I know a girl that used to pass out just by talking about blood, she studied medicine and only managed not to feel horrible by 4th year. It steadily got better with time so there is hope that you will 'outgrow' this problem. Meanwhile you could get a prescription for a beta-blocker from your doc. It is usualy used as a drug to treat hypertension (high blood pressure) but has numerous other good uses and is pretty harmless. It is not to be taken if you suffer from ashtma or diabetes, but otherwise very safe. You can start with a low dose and build it up to a level where it works for you. Hope this helps!