Hi Samantha,
My husband and I were told, a few years ago, that we would be unable to have children of our own. Turned out to be incorrect as we are now 26 weeks pregnant, but that was a nice surprise.
We considered both adoption and surrogacy, and eventually decided that surrogacy was more suited to us. We met with an agency and we were told that, due to my diabetes, I may be unable to become an egg donor, which would mean we would need to use the surrogate's egg. There weren't any other major issues with the diabetes, though. We were asked to fill out health questionnaires and the diabetes came up, of course. The agency didn't seem concerned about it; though, especially as it was well controlled.
Adoption may well be different but I would advise you to speak to one f the agencies and start getting he ball rolling. It will allow you to answer some of the questions you and your partner may have. If you feel that things start moving too quickly you can always take a step back.
Good luck with it all. Hope it works out.
Em x