If you feel overwhelmed contemplating a mobility/stretching regimen, simplify things and focus on your most problematic areas or the sites that you frequently aggravate/injure. This will get you consistent with the process while keeping you on a path of prevention from reinjury.
Of course you can just take a pill to lose weight, sometimes very rapidly, but true satisfaction comes from progress as a result of work done, and done consistently. Pride in the weight loss comes through perseverance, overcoming struggles, and being embedded in that process.
I find it pretty sad when I hear the same people talking about the same injuries amongst themselves constantly. But nothing can change whilst doing the same movement prep (if any), rep schemes, & workouts, then reverting to resting the area indefinitely in hopes it will improve.
A big reason to prioritize timely healing from an injury is that the longer you let it linger, the more problems you begin to develop elsewhere. The body is a master at compensation and will involve other parts of the body more frequently and improperly to help lagging areas.
Seeing a physical therapist and the training component of your rehab is mild, slow, and/or hasn't progressed at all over long periods? Then it's probably time to find a new PT. You can't have too much strength as a foundation for long-term success when recovering from injury.
You're making a mistake if you think that surgery is going to rectify the problems that all of your bad habits and poor movement got you into in the first place. If you can't avoid surgery, please find a pro who can help clean up your patterns and build a strength base afterward.
If you experience a flare-up along the way, learn from that and try something else. You'll quickly find where your capacity lies, which can also give you greater insight into the injury itself. This helps you fine-tune the process, and now you're on the fast track to recovery.
You won't know unless you try! There's a large contingent of folks out there who are searching for an exact blueprint on how to recover from a certain injury and, therefore, never get started on any path. Stop impeding yourself and research, try things, move around, experiment.
It's easy to be critical of yourself if there are physical ailments that are still nagging you, but give yourself credit if you're working on them and seeing improvement, no matter how small or how long it's taking.
Minimal Effective Dose: If you haven't seen a practitioner lately but are dealing with a previous injury & have or know techniques that worked for that ailment in the past, pick 2-3, keep them easy, don't disrupt your regular schedule. Low barrier to entry = increased compliance!