Does Anxiety, Fear Of Illness Causes Tremors, Shortness Of Breath And Diarrhoea?

For the last couple of weeks my neck has felt swollen and stiff. I went to the doctor and he said my thyroid gland was slightly swollen and referred me to get my blood tests. After doing so, my results returned normal with no abnormalities. Yet I still that my thyroid gland is swollen. I've noticed minor irritation around my neck whenever I wear a collared shirt. I got anxious and started googling symptoms of hyperthyroidism. Ever since I've read the symptoms, I've been experiencing some of them (hand tremors, weakness, shortness of breath, and diarrhea). I even started googling possibilities of other diseases and am getting more anxious. I am constantly feeling my lymph nodes and am noticing that they are not swollen whatsoever. My question is: could it be possible that my anxiety/fear of illness is causing my body to have these symptoms?