Right hip/side pain its a dull ache and comes out of nowhere im dehydrated and get constipation alot and have a bad diet if that has anything to do with it?

Dehydration can cause muscle cramp but not major joint pain. There is no causal relationship between constipation and musculoskeletal pain. Just take Ibuprofen 200 mg x2 tablets (OTC) every 6-8 hours as needed for the pain for 1-2 days. If pain does not resolve by then, see your doctor. Hydrate well and eating foods high in fiber for alleviating constipation.