Tennisgrl, it sounds like we are having the same worries.
This morning was my first PT session since I heard the pop. My PT was very much trying to convince me that everything was fine and that it was scar tissue I broke loose. Which part of me fully believes her, however I still have an uneasiness about it.
For me I am struggling with now that I broke things loose it feels different, so my frame of reference as far as "normal pain" is confusing to me. My PT assures me that because the scar tissue is gone it allows for more ROM and thus the muscles are still weak, adding to weak feeling. We did a few different strengthening exercises today so Im not sure if that is to blame for the ache and tiredness I am feeling with it today. Its hard now not to make more of any little ache or pain.
As for if it pops all the time, in my case not that I have noticed. It was just the one big pop and now it just feels weak, which my PT assures me will get better. I have had a dull pain, but I had that prior, I blame it on the snowstorms that keep hitting the Mid West. I live in Michigan and so far the shoulder is 2 for 2 in predicting storms, if I go 3 for 3 I will put my application in to be a weather person!
And dont worry my PT probably thinks Im crazy too. I called her literally as she walked in the building yesterday because I wanted someone to calm me down. I figure I cant be the craziest person she deals with.

Hang in there!