7weeks pp

i’ve been having some really bad headaches, they started around 2-3 weeks after i had my baby along w| some stomach pain and back pain, well the stomach and back pain finally stopped around 4-5 weeks. but im still having headaches.. i was taking ibuprofen for the stomach & back pain but that didn’t help it just went away. (really sudden pain last for about an hour and then just stop) well thursday i went to the dr and i told him about everything. he said “it’s bc i started my period” well then i told him the stomach & back pain didn’t happen while i was on my period happened WAAY before i even started bleeding again. & he said “well it’s just your body telling you it needs to start a period” and i keep questioning him bc obviously what he was saying didn’t make sense.. idk if i should go back to an ob dr or just go to my pcp..