I've also been in the position where I've had all kinds of ailments blamed on weight that have nothing to do with weight and boy, does it get frustrating.
However, I've also been in the position where I'm guilty of *thinking* it's going to be blamed on weight and so I've gone in there defensive before I've even told them what's wrong. In some cases, I think perception has a part to play in it.
On the other hand, the specialist who finally diagnosed my underlying genetic condition, which was causing all the weird stuff in the first place, said firmly to me "This is absolutely nothing to do with your weight. You'd still have the same problems if you were 10 stone and a size 8". We agreed that it wasn't *helping* me to manage my condition, but that's a different thing entirely. Again, perception has a part to play. How many times are we interpreting "it may help you to manage your condition if you lost some weight" as "it's all your fault because you're fat" ?
I've not been a massive fan of the medical profession so far, simply because I was misdiagnosed and dismissed for so long, but even I think it's unfair to tar every medical professional with the same brush.