MSM topical is nice also, if the tendon is near the skin surface.
For acute tendonitis, I would take 2-4 weeks off, do nothing but aerobics and lower body ( since its your arm ), and take ibuprofin 400mg x 2 for the first week, 400x1 for the 2nd. Stretch every day, including the injured area, ice down after all activities.
Continue with the stretching/icing after resumption of activities. Alwayws warm up before stretching or working out. I personally stretch after working out also.
Try not to get hooked on the ibuprofin, I did, its a crutch and will not allow your body to fully heal. But a couple weeks should be fine.