I've had connective tissue injuries throughout almost my whole body over decades of rock climbing.
Earlier in my climbing career, I tried going to physiotherapists with no positive benefits. I think it is fair to say it was a complete waste of time for the injuries I had. Ultrasound and all those other machines that shoot something at your body has never done anything for me. Same for acupuncture and some other stuff I tried.
The only therapy that has ever worked for me, and has worked repeatedly on different injuries, is Active Release which I discovered in the past 10 years. It is a brutally painful massage to break up scar tissue and relax muscles so blood can flow through them. Once blood is flowing to the areas with problems then nutrients can help heal the problems. Once muscles are relaxed then they are not chronically pulling on tendons and tendon-bone connections and keeping them inflamed. I believe foam rolling and the like are very mild cousins related to Active Release. I think any really painful massage by someone skilled to help heal injuries probably will help. I do it to myself now on my arms and it helps almost as much as having someone else do it.
The groin is a difficult place to work on yourself with your hands, a lacrosse ball, or foam roller. I've never had a groin pull that lasted more than a week or so and so never have had one treated.
http://www.activerelease.com/
Good luck. Injuries suck.