Assistance is required. Hurting badly.

I have too much pain in the upper abdomen going towards the back and causing me lot of discomfort and sufferance from past two weeks. I am having severe GERD with esophagitis grade B and fatty liver also. I also have hiatus hernia. I am a Bariatric patient done with sleeve gastrectomy and bcoz of my GERD condition where in manometry I have also got motility issue doctor suggested me to go for roux en y gastric bypass as there is no other option for me as PPI stopped working on me long back. But suddenly from past two weeks stomach is very badly paining and the pain is radiating to the back. Getting stool which is not going easily from the WC. Yesterday I did USG as suggested by the doctor and it has been found that I have infiltration of the pancreas and the tail of the pancreas is obscured with bowel gas so not visualised. Doctor please suggest if I need to do anything as stomach is hurting badly.