Expectations/Lifestyle change

To preface, I'm 27m 6ft currently at 260 at the moment. I'm on a cut, and I'm on about my thirdish week of this... new lifestyle.

I used to weigh about 365lbs in 2016. I had the wake up call. The doc was telling me stuff that I heard people tell my father when he was terribly unhealthy, except I was only 25 years old.

So I got on board. But all I did was diet. CICO and just persistence...

I really didn't workout during this time.... Last august I started self defense school, so I had cardio 3x a week but other than that it was just CICO. i stopped the self defense due to time constraints.

Now that I'm weightlifting this is a whole different ball game. This is serious, and it's a big change.

The physical changes are rocking me right now. Even though I'm cutting I try to get as much of a balanced meal as I can, but now I feel how important it is to have nutrition. Holy hell. New feeling on "eat like crap feel like crap."

This week I didn't eat so well (trying to get rid of some leftover ramen/busy with full time work and full time school/exams) and I'm experiencing so far two big things.

-Hunger on another level. I've never felt this kind of hunger Before my body would be like "you should probably eat." Now its like "you better eat something, soon!" I'm not really starving myself or anything and I try to eat as well as I can, but just some days its like hunger is dominating me. I feel this is good because I guess its my bodys way of telling me "we need to fix what you did in the gym, feed us so we can get to work." But even through my loss of appetite (meds) my body is like, overcoming that. Before hunger used to be a knock at the door, now some days it feels like a swat team.

-Heat. I am hot. Always hot. And here lately its this body heat thats keeping me up at night. I still am pretty heavy, 260 is kind of still big for me in terms of my sleep apnea. I still have it, though not as intense. Last night I could not fall asleep for anything. Even tried melatonin. When I can sleep, ZMA makes the sleep baller, but I actually have to feel drowsy. When I experience these nights, its usually water - I have a bad habit of not keeping myself hydrated due to past circumstances. Once I get a good, cool glass of water going I can feel my body cool down and its second before i'm snoozing. I try to work on it and swore I had tons of water the other day but no luck, I was hard stuck awake.

TLDR

I'm not necessarily asking for advice on medical issues, but rather, what else can I expect as I go through this journey? Are hunger and body heat the two big things? What happened to you and how intense were all of these changes? Ive been fat my entire life, so this is all very new to me. I'll see a physio/doctor on the 12th of next month so I'll discuss the sleep problem there.

I dont really have any friends in this at the moment, so its not like I can say "Bro are you feeling extra hot for no reason?"

For guys that have put on muscle who are first timers like me, can you just share all the new things you learned about your body? I've never "listened" to my body like this before ya know?