My upper arms have gotten alot bigger, as if retaining a ton of water, as opposed to just swelling - Will this go away?

The swelling should resolve with time. I would suggest SwellX tablets to ease the swelling, elevation of your arms, and massage.  I have co-authored a book on Miradry and have seen most symptoms resolve with time. Best, Dr. Karamanoukian Los Angeles

It is not typical to have that much swelling 2 weeks after the procedure.  I recommend you follow up with your doctor to discuss.

I recommend that you take a bioflavonoid formula called Swell-X which will help with this type of lymphatic swelling (lymphedema). Hopefully it will subside. You can order online.