Sorry that you’re dealing with this shoulder pain. It’s especially hard when traveling as you’re without your usual support.
You may read about some of my experience in this thread. I ended up getting a lot of pain relief and return of most range of motion by combining a cortisone shot with physical therapy. My pain started a year ago and while it is not completely resolved, I feel so much better than I did before I got the steroid shot.
I wish you the best in finding the source of your pain and hope you can find a suitable treatment. My reading about frozen shoulder is that there is no magic treatment. Sometimes just doing nothing ends up being just as successful as other methods. I’m happy I gave the cortisone injection a try. It brought me great relief.