I have been getting sick constantly. I don’t know if it’s Covid related, or because during my healing my immune system is lowered somehow?

Today I have a fever and body aches and I cannot stop freaking out. My parents always accused me of faking being sick growing up, so I’m terrified people will think I’m faking. Especially with how often I’ve been sick this year. I’m scared even my doctor thinks I’m faking. My second issue is having body aches/feeling hot or having cold chills sends me in to an anxiety attack. I do NOT like not being in control of my body. Feeling so uncomfortable and not being able to do a thing about it makes me flip. Then I feel even worse and it’s a viscous cycle. Does anyone go through the same things or have any tips?

Edited: a word