I think that would put you on the maximum dose of metformin. Wind is a common side-effect, but if it is really affecting your quality of life, then do go back to the doctor - or perhaps make an appointment with a different doctor if you are not happy with the current one - and ask to try the slow-release metformin (Glucophage SR). Don't worry about having to go back - I spent months going back to my doctor trying to find solutions to overcome problems I was suffering with side effects of various medications. You'll find that you will develop quite a tough skin when dealing with the medical community. YOU are who is important, they are paid to provide you with the best available treatments!
Some people find the metformin is better when eaten at certain times in relation to eating - when do you take yours?
We have a few people who also suffer from Coeliac's Disease, as it is relatively common amongst diabetics (particularly Type 1, as both are autoimmune diseases).