A few things:
* it's been a few years where you've had the problem. It's likely the problem won't go away over night - how long have you been having physio for now?
* You mentioned you're shoulders being sore or out of place - have you been getting treatment to that area? Where has the treatment been directed to, what has it involved?
* The fact that nothing showed up onMRI does not exclude those areas from being a source of your symptoms. MRI will not show up many causes of pain e.g. muscle tightness, fascial restriction,
facet joint tightness, neural irritation - which all may be a cause of your problems.
To me it sounds as if your ulnar nerve is being trapped in your shoulder - original location of pain suggests that, as does your agg activites. However, your physio should be explaining these things to you anyway and it should match up with any physical examination done on you.
Cheers