Otezla

anyone got advice please on how long side effects last with Otezla?,been on 30mg twice a day for around seven weeks now this included starter pack had a few tension type headaches at beginning but only for a couple of days also upset tummy but my upset tummy seems to be getting more frequent the longer I take it ,I'm hoping it will settle down in time as I've been lucky my psoriasis is already improving and dermatologist says it all looks promising , I've tried them all methotrexate ,cyclosporine, acitretin but with no success this is the first time in years I've felt confident with my medication and would hate to have to come off it any advice would be greatly appreciated