Some of what you mention, can overlap with thoracic outlet syndrome (TOS) for short.
We have a forum for it also , I suggest exploring there to see if the shoulder, neck & arm problems might come from that cause.
paralegal, computer & artist are arm/shoulder intensive factors.

TOS useful sticky thread- for crash course on it see post #1..and some therapy info included - http://neurotalk.psychcentral.com/thread84.html
here is one site that I always liked for basic starting TOS info, shows a few little tests you can try (not a 100% yes for tos but indicator that more testing is needed)
http://www.nismat.org/patients/injur...in-in-the-neck

I don't know if you have considered expert chiropractic care , maybe there are misalignments.
If the foundation is crooked , the building can fail..

The RSD/CRPS forum has sticky threads too about it.
Both conditions are possible too..

You & drs need to figure out for sure which you might have as treatments do vary..
Although both are a bit on the rare & unusual side for diagnosis.
Knowledgeable MDs, PTs, DCs etc are very important in these cases.