Had celiac artery stent placed 1 month ago. Was doing well except for past 3 days, had fevers/chills, body aches, abd pain and diarrhea. Coincidental stomach flu or possible complications/stent related?

Call the doctor! Almost anytime you get a fever after a procedure in the first 4-6 weeks (sometimes longer) its a good idea to call the doc that did the procedure and let him/her know what is going on. Then the decision can be made by the the person who best knows if your symptoms are a late complication of the surgery or procedure.