Ay, that's so painful, sis! A few of us mums dito sa grupo experienced that towards the end ng pregnancy, and honestly napakahirap, parang electric shock talaga ang feeling. What helped some of my friends was pelvic stretches, warm compress, and making sure they're not sitting for too long, but since you're already 33 weeks I'd really suggest checking with your OB kasi sometimes it gets worse towards delivery at need mo ng proper guidance para safe ang baby. Hoping you feel better soon!