Thanks for the replies! Judith I think you were pretty much spot on. It ended up getting to point where I couldn't lift my arm and with my physio on vacation for a couple of weeks I made the decision to back off and take some anti inflammatory. It got better quickly. So something is just aggravating it. My physio is back as of today and we looked at it again and modified some exercises and lightened the load and repetitions a lot.
Re the frozen shoulder, they considered it but I've had some imagining done on my neck and apparently that's all good. Thanks for the suggestions tho.