Hi @Leia .... sorry to hear this. A few of us currently have shoulder problems. :(
I am having an ultrasound on mine next week. Possibly bursitis but I had a frozen shoulder nearly 20 years ago that severely affected my ROM - it was manipulated under local anaesthetic but the surgeon said it could recur. :(
if you stand in front of the mirror and hold your arms out (like a cross) .. are both shoulders/underarm the same shape? With mine, the scapular was like a ‘wing’ that ‘came out’ as I raised my arms up! :( I knew I needed professional help then!
Do you have a care plan with your GP? You may be able to access subsidised physio .....
all the best. Xx