I read your post and had to go back to see if you have already been diagnosed which it sounds like you have been.
Your gp said this for what reason? A flare?
Do you not go see the rhemo for that?
Either way, your gp sounds like he just dismisses everything.
I have found that some gps just have no clue about illnesses, etc. they are good only for a flu, cold, visible things that we usually know we already have when we go there. Other than that, most of them are undereducated especially when it comes to Lupus !
I hope that if you are feeling unwell, you can go and see your rhemo or if no rhemo, change gps?