Unless it's a chemical imbalance, DON'T TAKE DRUGS.
You don't need them unless these feelings are truly caused by a chemical imbalance in your nerve cells....man, I hope I'm not wrong, but has anyone else noticed that we have a drug for darn every problem?
Anywho, here's my advice, and it's on the other side of the spectrum from everyone else--pick up a bible. I have weird feelings too, mainly depression from loneliness. I find that it helps a lot when I read God's Word. But, that's me--I know that does not work for everyone. I remember you had said you didn't believe in an afterlife and things of that sort, but if you ever change your mind, and have a few questions about it, drop me a PM.
Otherwise, therapy I guess is good, if you have a few hours and a few hundred dollars in your wallet; otherwise, just have a long one-on-one chat with a close friend. Who knows--you might find the solution you're looking for.
Hope everything goes well--sounds like you are having a rough time and I don't envy you of that...God's blessings in the future.