Why am I still losing weight?

So quick info: diagnosed 6 months ago, my A1C is now 5,9, on MDI.

So I know that I should see a doctor (and I am going to next week), but I had some sleepless nights about what's been happening to me recently. I am a pretty skinny dude, I've had about 75kg before diagnosis, when I was diagnosed I've had 69 and it stayed steady for a while. But since January I've dropped even more, now I am at 64,5.

I know for a fact, that it isn't because of high sugar levels, because I am controlled very well, which I confirmed last week from my A1C test. It's true that I try to eat meals with fewer carbs than before, but I didn't make any drastic changes to my eating regime. I also had my thyroid removed few years ago, but endo said that amount of thyroid medication was alright in January. I've also been having some weird nerve issues lately - tingling in arms and legs, muscle twitches, etc. That I tried taking B12 vitamin and magnesium on, with no effect. No idea if the weight loss and nerve issues are related.

I really don't know what's happening to me and frankly I'd be lying if I said that I'm not scared. Of course I'll get to a doctor as soon as next week, but I'd appreciate any possible explanations from you guys in the meantime.