Thanks Jason for the reply. I ask about discoloration to see if there might be any vascular issues such as a DVT in the veins of the arm (very uncommon but I have seen it before with people on a lot of pain meds and steriod users in the gym). I think if we forget all the recent treatment it sounds like is could be as simple as costovertebral joint perhaps in combination with a C4/C5 lateral disc bulge. I see this in combination a lot, especially as the local treatment of the painful rib area (usually close to the scapula on the rib cage as if it is a painful area) doesn't resolve until you treat the neck component. It can be in such cases that some manual therapy with guided neck retraction and extension +/- rotation can be really useful (although painful in the beginning as you try to reduce any lateral disc bulge). In terms of a +ve Roo's test (elevated arm stress test) this might also be positive when you are able to extend your thoacic cage fully so not sure it helps much in that case.
I think in relation to a possible scenario as I have mentioned above it is important to know that this is a very VERY common presentation and VERY normal. There is no real need to investigations other than manual movements of your spine and assessment of your symptom behaviour during and after mobilization of those areas. I would look maybe for a physiotherapist in your area who has skills in McKenzie 'Therapy' or his approach to the assessment of the neck and thoracic spine. This method has some very good self help exercises to administer at home once the physio has assessed what they believe to be the root cause of the problem.
If you were to have a further investigation at some stage and wanted to rule out any sinister pathology (as we call can get worries about such things from time to time) then a bone scan of the thoracic area would perhaps suffice as it would show any abnormal activity in the boney structures in that area.
Another very possible approach to this would be to get involved in some private (one-to-one) studio or 'Equipment' based pilates classes (not matwork classes) OR a private Gyrotonic class. I teach both and used them as a more natural way to restoring normal spinal movement and importantly 'breath' as well. Sometimes all it takes is 6-8 session to make a full recovery when the issues are more a mechanically restricted skeleton.