Had chronic elbow tendonitis for 2.5 months due to lifting. MRI is normal but elbow still in pain and stiff. Motrin and PT not helping. Ice or heat?

Ice massage. sounds like you may have lateral epicondylitis ( tennis elbow) which often responds to NSAIDs ( ibuprofen), rest( from 'power grip' activities, a tennis elbow' brace' and ice massage. If this is not working than a well- placed steroid injection can be very helpful. Recalcitrant cases may require PRP injections or tennis elbow surgery( arthroscopic or open). Best of Luck!