GF shouldn't cause you to lose weight by itself, but it might inspire changes in your diet which could. (actually GF prepared food tends to be full of sugar!)
I'm coeliac and been fully GF for a few years. It's a pain in the balls, if I didn't absolutely have to do it, I wouldn't. I don't know anything about your condition- whether it's a guaranteed aid or just a "something you might try" like it was with my mum's IBS "Go gluten free, see what happens".
What I would say for sure though is that it takes a bit of time and effort to do it well- so your first days on the diet are likely to be pretty disappointing, you need to sift through the options and find out what's good and what's not, work out alternatives etc. It gets better and easier.
Dove's farm pasta, Genius and Yes You Can bread (Yes You Can do a great brown, Genius do a good brown and a good seeded loaf and roll, nobody does a good white IMO), Glutafin Select Multipurpose Mix for a general purpose flour (especially if you can get it on prescription), Asda gf pizza for lazy food (add extra toppings!).
There was quite a good thread on here just a while back, generally to get good info on GF google coeliac, 9/10ths of all the advice for gluten free is pitched at us.