Rear Delt/Lat Pain OHP

I’m honestly not sure what sparked it, but anything involving overhead movement in my right arm causes notable pain and lack of mobility in my rear delt/lat/armpit.

Any drills that specifically target overhead mobility?

It’s not… debilitating. I dont notice anything on bench, or pullups, it doesnt hurt when not under load, and there is only a slight twinge when doing dislocates. However, I put… 95 pounds on a bar, and I just crumble. Even landmine presses set it off.

I dont quite want to go visit a doctor yet, just want to try some simple drills first.

So… help?