Your immune system lowers when under a lot of anxiety or stress, so that could be one explanation. Sometimes, it doesn't even have to do with your immune system; your body could simply be responding to the stress/anxiety.

I have been nauseous for 2 weeks now. I have thrown up some days too. I went to my primary and she told me there's no medical reason why I should be sick. She even did a urine test to check for infection and pregnancy. Both negative. She agreed with me that it's most likely the high anxiety I'm feeling after opening up about my past with my T.

Best thing to do is take care of yourself physically and mentally as best you can. Drink juice, eat yogurt, get enough rest, drink fluids, take zinc.

I hope you feel better!