I can't have the A&W Cheesburgers !

In the last 2 weeks I have had a Cheesburger from A&W twice. First time was with Fries and a Sierra Mist. I paid for it the rest of the afternoon, 7 trips to the bathroom and bad pain.  I thought it might be the fries, so last week I had one with a Sierra Mist and no fries.  I know the soda does not bother me.  Well, I paid for it again that afternoon. Exact same symptoms.    Looks like no more greasy cheesburgers.