Back/Neck pain due to my condition

Lately I've been having pain in my upper back, neck and shoulders. I've been diagnosed with Macromastia last year, and since then I've been slowly growing through the alphabet. I thought it might just be my bra not fitting me correctly, but I have this pain even without wearing a bra. Laying down and painkillers help, but I can't stay on my feet for more than a few hours without needing to sit for 10 minutes to recover.

Although I shouldn't be doing this, I rest my boobs on the table which really helps take off the weight from my chest but it's not always something I can do (especially in public!)

I've heard wearing a pregnancy bra would help but I'm not sure.