i think it's great you took the initiative and went out to get your answer's. far too often people take what there G.P's say s gospel and don't think to challenge their advice or decisions.
GP Doctors are Doctors yes but they are not infallible. you have the right to a second opinion and should not be made to feel like a right tit for asking for one.
Also GP's I have found can be either helpful or condescending muppets who think they are dealing with nothing more than a hypochondriac (i got this when i was a kid, I was leaving said GP's surgery with my mum when i had a long fit outside and almost was run over by a car in the car park (Mum had popped back in to grab my asma prescription so wasn't there to stop me, i didn't even remember leaving the curb). I came out with a concussion and the FANTASTIC story about Mum pinning the Doctor to the wall and asking him for his option now, ok there was no actual pinning but I'm told she brought an epic smack down on him)
you know your body for the most part if something doesn't feel right, go with that feeling, push the issue's until you have found your answer's and never think for one minute that you fussing over nothing because sometimes it isn't nothing.