I think the doc must have hit the nerve directly with the needle. A one in a few hundred chance. Still, it shouldn't have happened.
I think you are beginning to be unnerved by all these tests, quite propably close to a depression, and the horrible pain was the drop that made the bucket overflow. I know it's far easier said than done but try to relax and think positive. Get some comfort food and as much sleep and as many hugs as possible, talk with friends and rant as much as you can. It'll help you remaining sane.