Hi Amelia! I am currently on a pump and taking Symlin. Cant help you with the met though.
First of all, you have to compartmentalize these therapies. The met is simply for IR. The insulin and the Symlin are to simply replace what your body no longer produces on its own. Amylin is produced by the same beta cells in the pancreas as insulin. So for a T1, no one is producing it. You already know the function of insulin, but amylin's function is to slow gastric emptying, and provide satiety. The result is you feel full sooner, and have less of a post-meal spike. The weight loss is simply a side effect of Symlin, but certainly not guaranteed.
With that said, it has worked well for me. On average I use about 10-15% less insulin for bolus, and has leveled out my post-meal spikes. I have not experienced any weight loss.
Alright. With that out of the way (I hope I didnt repeat anything you already knew), based on what youve said I think its time to shop for a new endo. Flat out telling someone NO to prescribe something that 1. replaces what your body doesnt produce, and 2. may help you, is unacceptable.
Symlin therapy is still somewhat new, and I suspect your endo is simply unaware of its function or benefit. Either way, I would shop.
Hope that helps!