How can I fix tiredness and fatigue?

Hello! I'm 13 years old and just went through one of the lowest times of my life. I had constant stress, anxiety for 2 months and it was because I kept having a lot unwanted thoughts. Now it's pretty much calmed down, I don't care as much anymore but I still do some things to lessen my anxiety throughout the day. These days, I have been feeling very tired. I do go to sleep pretty late, yes (3AM-5AM..) but before I was sleeping and eating well and still feeling extremely tired. This has sorta drained my work ethic even though I still do a lot of my tasks needed. Today I decided I would just stretch even though I knew I was fully PHYSICALLY capable of doing so, I just didn't want to. I know that's a horrible mindset and habit, but I used to have some form of energy, even if not motivation I'd just get up and do it even with no motivation. Now I feel like my teeth grinds at it, I feel tired, and worst of all I feel alone. I don't know what to do with this...