This is similar to me having to have my root canal! Pap smears... hate them. I am good, I go every year like I'm supposed to but the terror is still there.
I commend you for knowing your body & that this is not 'your depression'. Stress is a serious thing as well. It can wreck havoc on your immune system, causing you to be sick. I don't know if they have tests for that or not per se. I hope you find the answers you are looking for. I was down this road myself for a few years. They believed I was sick but in my case, everything was normal. No high blood pressure, no blood in urine, I was supposedly healthy. At least w/ you, they have signs they can go on.
Love,
RhysMadison