[Crowbob]

If you know you'll be working the affected area, spend lots of time warming up, stretching, pace yourself and rest often.

I gave myself epicondylitis (tennis elbow) raking leaves. Nowadays I rake for a minute, rest, rake some more gradually increasing. An anti inflammatory before stressing the tendon also helps. Tendinitis requires rest. What used to be normal activities are now interpreted by my body as abuse. It may never go away especially if you plan on getting older, which is usually the preferred option.