Just tell them you have this massive crippling anxiety disorder which has a strong chance of making you an unreliable juror. If it causes you to have to pull out that could mean the huge expense of starting the trial all over again. So you could ask them to exempt you on medical grounds. If they refuse have your condition noted anyway, then if you are made to go & if you get really badly ill that's their fault & they're responsible. A doctor's note would be very helpful to back up your claim.
Contact the court.
Ask your doctor to write a note. Send it to the clerk of the court and you will be excused.
I have a massive anxiety disorder... like crippling sometimes. I was called out to jury duty and I was wondering if there's any way possible that I could get out of it? I feel like crying and having a panic attack just thinking about it right now...