So freaking exhausted... But why?!?!

I don't know if I need to vent or if I'm seeking advice but I just need to get this off my chest. I am 33 years old. I struggled with addiction for about 15 years. I have been sober since February 6th 2023 which is also my daughter's birthday.. I'm fortunate enough to have very supportive family. My mom and stepdad have property and they built a two-bedroom house/ apartment for my daughter and I on their property. I just want to make it clear that I am beyond grateful for the support I have from my family. I guess my question is why am I so tired? I get plenty of sleep at night. I'm a stay-at-home mom. I can sleep 10 hours at night and I wake up still exhausted and if I sit on the couch with my daughter after breakfast I will fall asleep. At any point in the day if I sit down I will fall asleep and it terrifies me... I do sleep when my daughter takes a nap for 2 hours. But I'm still tired no matter what. Tired all the time. Is this just from years of using drugs? Does it ever go away? I have talked to my doctor and I am scheduled for a sleep study consultation but the soonest I can get in is May 12th. I will try anything to not be exhausted all day. So if anybody has any suggestions I would greatly appreciate it. Thank you!