You mention symptoms in arms, shoulders, pinky and ring finger...
You might want to read on our Thoracic Outlet Syndrome forum(TOS) for short.. check out the sticky threads there.
Any repetitive motion activities, computer, desk work, forward head or shoulders?
Past whiplash, weight lifting, collar bone or shoulder injuries can be a factor..
Unfortunately not all doctors or PTs are fully up on the syndrome. So if you thinks it fits after reading about it, look for a highly skilled provider. A very good PT or DC can be helpful.