Post gastric bypass and hiatial hernia surgery pain, tachacardic, and short of breath after eating along with pain in stomach and back diagnosis?

GO TO ER: With such features, I would like to ask you to be checked out to rule out perforation or some other serious issue going on. Hope you get well soon

Can't tell: you need to see the team who performed the surgery or got to the hospital where it was performed, as what you described requires medical attention, physical examination and probably imaging studies too, to reach a diagnosis, good luck