I have a slight tingling in my left hand at times, and when my arm is bent under my pillow, ive found that my left hand and forearm go to sleep. I have been trying to gain weight this year and am up to 180 pounds, after being around 155 160 for the past 10+. Ive been doing curls with resistance bands and i also play keyboard at home, i wasn t sure what could be the cause of this. i easily get anxiety attacks when i cant figure out whats wrong with me, but im assuming it s not anything major because im pretty fit and have a normal blood pressure