From my experience disuse of an injured body part, arms and shoulders particularly, can lead to the extremity "freezing." Basically the scar tissue seizes up the joint and it is very hard to get back to any normal level of function. Frozen shoulder requires some pretty hefty PT if my memory serves me correctly. I would keep doing some gentle range of motion exercises every day and take anti-inflammatories if you can until you can be seen and get back on board with your claim.