Cold therapy after. Icing will bring the swelling down or prevent any from building up. I agree with taping as well. KT or KB tape is great. Take a few minutes and go to youtube and search different ways to tape. It will help a lot.
http://www.kingbrand.com/KB-Support-Tape.php?REF=34PV173.316

Try stretching before and after the run

Check out this article on different exercises. http://runnersconnect.net/running-injury-prevention/achilles-tendonitis-and-insertional-achilles-tendinopathy-in-runners/
Also has plenty of personal comments of experiences and advice. I also tape my ankle regularly now. Seems to help a lot. Check out YouTube for different ways to tape.

Physical therapy

I run a few times a week for years and nothing has changed, except I am getting older. I think I am developing achilles tendonitis just from years of over strain. Anyone else been dealing with this and have any advice?