Welcome....sorry you have to be here, but you will find it a wonderful place full of really smart and caring people!

Have you had a doppler ultrasound of your brachial plexus to rule out vascular involvement. With the swelling you are describing you could have vascular compression and that needs sorting our ASAP. if u do have vascular tos you are at risk for clots and stroke....not to worry you but it needs looked into asap as I said.

Have you had a simple chest xray to look for cervical ribs? perhaps you are one of the lucky ones. During your pregnancy your ribs get compressed due to the growing little one and that could have been an issue for you especially if you have cervical ribs. All you need is a chest xray to get that discovered and ruled out or in.

have you had an emg?? it can tell a lot about the compression you may be having. Usually us tos'ers have normal emg's but there are a few who have had really bad tos that has lasted for a long time and loose nerve function.
This is a fast and realatively painless test as well.

just a few things to think about.

take care and welcome again!
hugs,
Victoria