Tendonitis and Exercise

How do I reduce and/or eliminate pain from tendonitis without stopping my workouts?

I have tendonitis (or so my doctor has concluded) in my right lower leg. I am a newly avid runner (three times a week, 2.25 miles or more each plus at least one or two other workouts). I don’t want to stop working out, and I don’t want to permanently seriously injure myself. Any stretches/strengthening/other ideas are GREATLY appreciated.