At greasy food with in hours belching, wake up with sweats, vomiting middle back pain nauseated fever could this b gallbladder, went to er labs normal?

Yes, need ultrasound: The symptoms you provide could be associated with gallbladder inflammation or cholecystitis, usually associated with gallstones. The test for this is initially a liver/gallbladder ultrasound. Bloodwork may or may not be useful, depending on the acuteness and whether the gallstones are blocking only the gallbladder or other bile ducts. If this is negative, other tests should be considered.