One leg small all of sudden. Left body?

I had an minor accident 2 years back, but no issues for 6 months atleast after that but During WFH, I felt my left leg small all of sudden , doctor did sonography and told it's 4- 5 cms small How is that possible? I didn't feel that till that date. Does that effect all of my left body?i feel I am losing muscle on left abs under my elf rib. Now I am having things like lower back left pain , left thigh lil thinner than left, left buttocks while sitting is smaller than right , right is thick and big. Left chest feels hallow and sometimes I get left neck and headache. I did brain MRI, spine MRI, blood tests, BP, sugar , ENMG ,XRay , all are fine except vitamin D and B12 , I am taking suppliments for that. Please help me. In some way I feel my right body bones are bigger and stiffer and hence bigger and heavy muscles on right side. Please help.