First of all, don’t try to make “dramatic” and quick changes in your body. Doing that leads to more problems than any chronic problem that you may already have, such as overweight and hypertension.
Without a whole lot more information from you about the type of pain, exact location, duration, information on the sneezes, etc. even the best diagnostician in the world can’t say anything for sure without seeing you in person. Aside from that, we are not “the best diagnosticians in the world”, and even “the best diagnostician in Fluther” would say “see a doctor”.