little big mama

I have been banded for a week which has been rather rough. I have had extreme gas pains thru my back and and now throwing up this foam every time I drink something. Am only sipping, that is all I can possibly do. Also I feel like most of meds I am taking come right back up. Dr.did not fill band at all, so can it be too tight? Back pains have been easing off but still can't seem to keep anything down for long. Does anyone have any advise?????? I am no where near taking in required oz of fluids much less protein. The good news is 12 lbs lost in 6 days but how long can I go on like this. Amazingly my energy level is good at the moment.