Struggling with Sleep: Seeking Advice

I am currently having a huge problem with sleep and I don't know if it's my adhd or if it's insomnia not yet diagnosed. I find it incredibly hard to slow down and go to sleep at night even when I was working all day. I am able to stay up for 5 days straight and my body still won't let me sleep. I was fine with this before because I could manage but now I'm living with my feonce and he is nurotipical, he is very understanding and honesty I couldn't ask for anyone better but it's aggravating because while I toss and turn trying to go tf to sleep I end up waking him up when he has to get up in the morning. I tried cutting caffeine out of my life entirely not only for sleep but also for heart problems but it helped neither issue even tho I did it for months on end. my type of adhd makes it wear caffeine makes me tired so I tried to drink caffeine to go to sleep and while I felt tired after I still couldn't go to sleep. if anyone has any suggestions at all please share them. Thanks.