Suggest Treatment For Diarrhea, Soreness In Abdomen Along With Recurrent Diverticulosis

Have had diverticuloses for four years. Usually one attack per year. I've been on methotraxate for psoriasis for 2 weeks. For the last 4 days I have had diarrhea and today my lower left side of my abdomen is sore and have had some pain. Could the methotrexate cause me to be more prone to have a diverticulitis attack?