Oral medications  plus physiotherapy may help u but if severity is more painkillers wont help u much.....plus give u complcations too of long term painkiller intake......go to a good physician/orthopaedician .... For more severe sacroilitis we can give local injection of steroid at pain site....quick relief....with no side effects.....but being an ot procedure ..it is expensive w.r.t oral therapy...