Get an MRI first!!!
Because if it's not inflammation / irritation, but TEARING... you're changing it from a simple shot or very simple surgery to a massive reconstruction with months worth of recovery time.
I use something similar to the yoga concept on my knees. The concept is that when your need a total joint replacement or massive reconstruction because the tendons and ligaments are shot, to use your muscles to hold your bones together. This isn't a fix, but temporary solution that ONLY works for very specific problems, ONLY works as long as you can keep the muscles doing a job they weren't designed for, and can make problems go from bad to worse. I've been doing it for... sheesh, almost 20 years. I'm in daily pain, and any time I get sick or injured (or pregnant) and CAN'T keep the strengthening exercises I fall to pieces. Extreme pain, nerve damage, and joint damage are all side effects of this strengthening treatment, but was my only option, becase at first I was too young for joint replacement, and then my bones weren't in good enough condition, and now there are alternate surgeries that MAY be possible (cadaver tissue! I'm a zombie!! :D, but we're talking MANY surgeries over a couple years, with a couple years of rehab.
So 20 years of pain, and we may wait another 10, to see how the science and tech improves.
30 years of daily pain.
Versus my shoulder... which I tore to shreds last winter, got the surgery this fall (my son was sick for 6mo or I'd have done it sooner) and TWO MONTHS later, I'm pain free and working on stretching and strengthening!!!
With my knees... I'D NEVER HAVE NEEDED THEM TO BE REPLACED (or the surgeries I may get now-ish) if I'd had an MRI back when the problems first started. Instead, I kept competeing until I couldn't walk anymore. By the time I quit pushing through the pain... I'd ruined my knees. It took over a year of physical therapy 3x per week to learn to walk again, and I've been in daily pain ever since.
GET the MRI. Hope it's simple inflamation, but don't ruin a joint in trying to push through / find other ways to deal. You NEVER have to say "yes" to a surgery... but finding out what is actually wrong is pretty crucial to how you treat it!