Help Needed, Seriously Guys

Hey everyone, hope you're all doing well and can offer a bit of advice.

So, about me-guys, I'm South Asian, 26, weigh in at 90KGS (man, it's tough), stand 170CM tall. I've got Type 2 diabetes with an HB1AC level that's been hovering around 9+ and a BP of 140/110-on the meds for sure, metformin and losar are my go-to.

Back in the day, when they first diagnosed me at 24, I was super positive about it. Even though I've had this going on for three years now, working in IT with a job that's been chill but comfy to the poitn of being stifling. Lately, though, everything feels off-hate everyone without reason and always feel annoyed, stressed, rushed.

And here's the kicker: I'm getting hitched in a couple of months.My fiancée keeps asking me to spend time with her and honestly, it's hard work for me. Can't seem to find my motivation no matter what.

I know I need to change this but somehow just can't stop putting it off.
Anyone got any practical tips that might help?