Take a breath and relax. I took lexapro for my depression too. You will just have to figure out what works best for you. I have tried many different medications, but none worked for me. Buspar is very effective with panic attacks. I know because I did take it to help me relax and fall asleep in the evenings, and it was somewhat ok. I had an Aunt that was using it for a long time and it made things much much better for her.
You might want to ask your psychiatrist about this drug.
Don't be afraid. Nothing terrible is going to happen like you think it will. You already know for a fact that all the pains and anxieties you feel is from your condition, so that's a good thing!
Take a moment to stop and breath and tell yourself that what you are going through is something that you can overcome. Tell your body what to do, don't let it control you. Then see your psychiatrist as soon as you can.
Good luck.