I love oatmeal and never had any problems from certified gluten-free oats. I was extremely sick at diagnosis also, yet trialed oatmeal within months of starting the gluten-free diet. Tolerated it extremely well so go figure, huh?
I think it is a very independent thing and people react very differently depending on a number of things. I do not believe that everyone needs to wait a year to try them, either. That is just the medical profession instilling fear where it doesn't need to be. One should never be nervous when adding back foods into their diet. I am not really sure if oatmeal would aggravate acid reflux but if you do well with other high fiber foods, it might be OK for you to try. You will not know if you are one of a very few who cannot tolerate gluten-free oats until you actually try them. But it will not set you back to square one if you do have a reaction.
I wish you luck....I love oatmeal too!