No good advice here, just sympathy -- or empathy, if you will, having been injured before. It was really hard for me to feel like I had to ask permission from my body (or my PT ) to do anything for a good 3-4 months.

My PT always reminded me how long it took me to get to the point I got - several months of using the injured system every day the wrong way, compensating for a lack of alignment or whatever it was that started it - and that I couldn't expect for it to get UNdone quickly just out of sheer will. All that bad muscle memory I built had to be re-built, and it would take a lot of time, even after graduating PT, to keep rebuilding and maintaining it correctly.

August is a long time away. If you can't do it safely, you can't do it, but don't get disappointed in yourself that far in advance just yet. One day at a time.