I'm not sure I can be much help as I'm t2 and was diagnosed a lot older (as well as worked on wards where I saw the complications). Motivation is a very personal thing. For me I find my personal motivation in my desire to be as healthy as possible and avoid the horrendous complications that I saw in the hospital.
So ask yourself What motivates you and gets you through exams or tough times,
Maybe A new dress or A small treat at the end of the week? Find something that you are happy to put the effort into getting and set small goals like after a day of testing then X happens, after week y and so on and so forth. Slowly you should find yourself getting back into the habit/ having no problems again. However if this isn't a technique that works for you maybe someone else will come by and be able to suggest something else for you. I'm afraid I'm still new to this whole thing.