Nice But Dim Jim said:
It is but you can also look at it as an opportunity to figure out how to survive and then know, if you do, that you won't have to be dependent on another job again because you will be able to survive most anything. Having my back up against a wall inspires some great ideas in me, maybe it will with you.
Here is my advice. You don't need drugs. It is completely normal to be freaked out and scared after quitting your job. It is completely normal to have stress. Your not having a break down, your stressed. Stress is good. Drugs make you dependent on them... on your doctor and they some nutty side effects that only make it worse. You need to be clear headed and alert for this new job.
I would recommend that you look to ways of coping with anxiety and fear. One good thing that worked and works for me when I am freaking, is the power of now by Eckhart Tolle. (I am sure he has a website) Really some wise words in there that may calm you right down. Basically his idea is "don't get ahead of yourself" and anticipate. Focus on what is happening right now. And that is it.
Also and this always helps me... basically he says that your brain is different than your mind. Your mind is like your soul and you. Your brain is an endless mess of emotion and stress and negative thoughts that he calls "the ego". If you can learn to recognize that your ego is not you... and you don't have to listen to it, and it means nothing but is thoughts that aren't reality, you will be calm. This always does the trick for me. I just kind of laugh at my ego and say, you are just thoughts. You aren't real. The more associated that your mind is with your ego, the more unhappy you are. But if you disassociate YOU from this ego, it loses its power.