Lapband problems? Episode/vomiting food w/ black stuff, then vomiting black phlegm. Lasted 6 hours, vomited 10 times/more.

Had band for 6/7 years. No problems till 6/2016. Vomiting so bad till blood then couldn't even drink fluids. Went to ER, did test,no slippage. Dr removed some fluid, did better so put more fluid back in band. Started same sypmtoms. Removed more fluid. Dr. did removal fluid/fluid back in 2 times. Finally took all fluids out. Did better, started gaining weight but could tell still couldn't eat certain foods/some vomiting. The episode explained above happened about 2 months after took all fluid out.