Anybody had a muscle biopsy or an EMG?

After six months of PFS, my muscle condition has not improved at all.My limbs were weak, my limbs were easily numb, my muscles twitched.I can only jog. My muscle twitches get worse after strenuous exercise.
I want to do a muscle biopsy to get a more detailed picture of the muscle.But a muscle biopsy will remove a piece of flesh from my body, and I don’t want to suffer any more.So I was wondering if anyone has any experience with muscle biopsy or EMG.