Bicep/wrist pain, tingling elbow/fingers what causes this? electrolytes ok, neck mri neg, xray of arm neg. dont know what else to do.

Look to shoulder: Pain fr. Biceps (anterior shoulder) to wrist implicates cervical spine/shoulder. With nl MRI cervical spinal root impingement doubtful. Carpal & cubital (elbow) tunnel nerve impingements don't arouse shoulder pain. Elbow/hand parasthesias (tingling) common with brachial plexus neural impingement by mass (imaging ruled out) or thoracic outlet syndrome. See physiatrist or osteopath to diagnose.

EMG/NCV: I would definitely recommend an emg/ncv. Your symptoms definitely sound neurogenic and there are a number of peripheral nerve compression syndromes that occur in the upper extremity. Hope this helps:).