Tyno, I had similar problem with my doctor, but he didn't sneer, he mumbled under his breath and didn't follow through on blood tests or anything. So, I fired him and got a new doc. Granted, it took me 2 years to finally give up and change docs. It would be worth a try to change docs if you can.
btw: this same doc never finished the sleep study for my husband and he repeated it two years later (a week ago) and was finally diagnosed. Some docs are just awful and you gotta fire em.
Its sooo hard with the docs, mine also looks at me as if to say 'Not this woman again" He makes me beg and feel bad about taking meds that I couldnt do without. Im not on many and I dont misuse. I have a pain specialise/rheumy who gives me my pain meds now and with the right ones ,your life can be bearable. Look at changing docs, im at the same stage also its just so very hard , time consuming, and hard emotionally to go through it all again, but your doc sounds even worse than mine.
You should see a specialist also. It took me two specialists to find one who understamds and two docs just to get the one ive got who isnt the best either. keep looking, he sounds like a total pig of a man. sue2z