Since you haven't yet posted an update I don't know how you're doing. I really hope things have improved.
I can only echo what many have already said - see a psychiatrist or psychologist, someone who is trained in this area. You might not need medication, a form of therapy could work for you.
I have Major Depressive Disorder (since childhood) and I resisted medication for years. After experimenting with various drugs (under the supervision of a psychiatrist of course!), I finally found that Zoloft works best for me. If you need to go on medication then don't be afraid to tell your doctor about all the side-effects. A responsible doctor will work with you to find the correct combination/dosage for you.
I also see a clinical psychologist once a week and that, in conjunction with the medication, has done wonders for me.
You're brave to acknowledge that something is wrong and you need help. Good luck and if you need to pm me to ask me anything else about this...please feel free to do so.