Joint pain with extended BF/gradual weaning?

3litttlebirds

My son just turned 3 and has very gradually weaned over the years. My period returned 6 months PP, but only in the past few months has it become a more normal flow since my son now just breastfeeds about once at night. 

Also in the past couple months, I have started experiencing a mild burning sensation and achiness near my collarbone, under my arms, along the outer sides of my breasts. I also have some occasional itching and pinching/twisting sensations. Again, it's all very mild. More of a discomfort than a pain. It is causing some mild radiating pain down my arms, which is annoying. And also a feeling of my breasts being slightly more sensitive. It's on one side more than the other, but he breastfed from one side much more than the other since birth.

I saw my Gyn yesterday and she thinks this may be symptoms of weaning, as my physical breast exam was normal. But she is having me come back next month for another breast exam and an ultrasound if I'm still experiencing discomfort.

My question is: For those who weaned very, very gradually...did you still have any symptoms? And what were they? The joint pain is making me worry that it's something else other than hormones...

Thanks so much!