Extreme weakness in my arms and upper body

Hi guys. I’m 11 months in. I’ve slowly improved over the last 6 months with plenty of bumps in the road. I was a sporty and active 32 year old before I caught covid, who enjoyed running, cycling, lifting weights.

My biggest trigger now seems to be when I have to lift/grip something with my arms. Even if it’s not particularly heavy, I get fatigue, brain fog and dizzyness.

This feels strange because my legs have improved quite a lot, and I’m able to walk reasonable distances (40 mins) without too many issues. But my arms feel so weak.

Has anyone experienced anything similar? Have any treatments/supplements/exercises worked? I have no idea why my arms aren’t improving, it’s really worrying me.