Pain in the armpit or chest muscles

After several months of treatment for frozen shoulder and ongoing suffering, the pain has significantly decreased recently.

My arm doesn't lift as well as it used to, but I am stretching little by little and looking at it for a long time. That's okay so far.

Even though I didn't bend or move my arm very much, just stretching it slightly wider causes severe pain in the armpit and chest muscles.

It's a feeling. Maybe like the sensation of having a cramp? Actually, I'm not sure if that's the right way to describe it.

Because it hurts quite a bit, you need to let it settle down for about 5 to 10 minutes. I don't know what the problem is.

I'm not sure which department I should visit for this. Should I just go to the pain medicine department again?

Is there anyone who has had this experience?