i have always had on and off pain in my left tricep when lifting. it went away for a couple weeks and as i started lifting seriously the past week sometimes when im lifting it will just die and i completely lose strength in it, its real dangerous as i almost dropped a dumbell today. any ideas as to what u think it could be, i went to the doctor a month ago and he said just give it rest, thats what i did and it went away but now its back