My own fault

A week after I ran the Death Race I went on a 19 km run. It wasn’t too bad, but I got cocky; I charged up a hill faster than I should have. Ever since then I’ve had a muscle in my buttock that has not felt good. Well, something back there hasn’t been good. Pulled muscle? Torn ligament? I don’t know.
I’ve still been running, but I’ve been taking it easier on hills. And I don’t try to race faster. Still, the injury remains after a month.
Today I went to my physical therapist. It’s weird. I haven’t been there for over a year, and I feel like I should be going there more often. Is my natural state to be injured?
Anyway, I’ve got some stretches I’m supposed to do every day. Unfortunately I’m not supposed to run more than 10km. This is going to kill my Sunday mornings. But, they never said anything about not running more often, just not as far.
And I’m supposed to warm up before stretching…