IMO not much you can do about it, it can be the risk coming along when you decide to play tennis (often). And I wouldn't say it's "unhealable", but let's agree on that it it could be very hard to get ridden of it.
A few little things you can do in order to try (better) preventing it:
- do careful but effective stretching of your shoulder and forearm tendons/muscles before and after(!) playing tennis. Repeat once.
- don't play string tensions like Haas or Roddick. Prefer softer ones, your arm will appreciate it
- play with vibration dampeners
- play not with a racket that is weight-orientated towards its "head"
- avoid big mishits as often as possible
- switch to a double handed backhand
- if it applies, check your tecnique... also improper technique and execution of the strokes can cause problems over long time
- try to use (more often) "swing" instead of plain power
BTW, Epikondylalgia could be misleading but I think what you know. You mean epicondylitis or simply what's called a "tennis elbow". You should rename it.
Personally, as of yet, I don't have experience with this problem yet. I'm not playing tennis often enough, I think