Armpit seroma please help

I had a lymph node removed from my armpit to check for occult breast cancer. About 5 days later I've developed a large seroma in my armpit that is very painful. I had it drained one time and it immediately refilled. My surgeon says we might need to drain it again but it was unlikely he'd have to put a tube in. It's very big, the size of a golfball. This is a general surgeon, not a breast surgeon(long story). Please advise if I should continue to drain this thing, leave it alone, or request a tube be put in. I'm miserable because I can't sleep.