28 female.2wk back ache in lower back,sides,bloating,feel sick and full.tender t touch around belly button area.just had antibiotics for a water infection?

Get seen immediately: This is very suspicious for an infection of some sort inside your abdomen. It could be a complication of your recent urinary tract infection, or entirely different; or perhaps your previous UTI diagnosis was mistaken. Whatever the cause, this could be very serious. Contact your doctor now, even after hours; or go to an emergency room or urgent care clinic immediatley. Good luck!