My Strange Symptoms. Vitamin d normal.

I've been experiencing strange symptoms that my doctors have been unable to identify. Jan 2020: I began experiencing fatigue/heavy/sinking sensations in my chest and neck. I thought these weren't important because I was able to work out without exhaustion and brushed them off as stress and anxiety. December 2020, I started hearing ringing in my ears (Tinnitus) and felt a lot of tension at the base of my skull around my C1-C3 vertebrae, and tension behind my sinuses. I felt extreme fatigue even without exercise. I went to the instacare twice around Christmas, but they couldn't find anything wrong with me. B12 normal, COVID came back negative, tests for mono came back negative. In January I went to the ENT and got a CT scan, no hearing loss, no sinus infection, no fluid in my ears, no abnormal pressure. A few months went by with no improvement. My symptoms got worse. Visited a hematologist, blood work came back normal - no autoimmune, no cancer, no anemia, vitamin D normal.