Is there any way I can possibly reverse this? I'm like 80% sure I've fucked up my right arm because no matter what I do or how I do it, picking is just impossible now (especially palm muting) because my shoulder gets so tired after about 3 seconds of anything. I've tried posture, making sure I'm moving my wrist, playing in classical position, everything. I've tried everything I can think of, or have been suggested to do, etc. My arm is just fucked. I'm in a band and I really don't want to give up guitar.