In july after 20/7 time at my pc with my arms bent,i developed a knot below the inner crook of my left arm with tingling&numbness.my gp said not to strain it&gave me antinflammatories but the numbness &weakness in my whole arm still persists alot?

Impingement: It appears that there is a nerve impingement by bones, muscle, tendons or cartilage at the level of the elbow causing the (probably ulnar) nerve to be swollen or damaged. I recommend consulting an orthopedic surgeon for evaluation and treatment options. Appropriate studies, including a possible EMG, will be ordered. Physical and occupational therapy will most likely be needed.