Since you are going into a bad state, you should call your doctor immediately to get some help.

It sounds like you have a great opportunity coming in your life and you need to get help now so that you will be ready. You didn't mention if you were seeing a psychiatrist or psychologist so I would suggest seeing both. It took quite a while for us to find a good combination of drugs to keep me relatively stable (along with ECT). A psychologist can help you find more healthy coping skills that will reduce your stress and help you in your new job.