Afraid of muscle dystrophy. Back side.

Hi sir, Before 2 years I had an accident. For next 5 months I didn't have any symptoms but later I started to feel my left side of body is thinning. Like I can feel as if my skin is thinning in left side. I can feel bones on left ribcage than right. I feel left neck thinner than right,feel like swallowing from left.and feel like left cheek is smaller than right. I got brain and spine mri, both are normal with mild scolosis. But every time I wake up, I feel as if my left body is lighter and right body is heavier. Feel left thigh is smaller than right I am afraid if it's musle dystrophy ans as it is progressive it will become more and more thin. There are few points where if I touch on my left rib back and side, muscle feels squishy and tender. Please help , I am afraid if I'd be disabled. Currently strength wise left is fine but I feel one side is thicker and other side thin so I can feel the ribs in back side.