I’ve been dealing with similar stuff, and I totally get the exhaustion and heat issues. For the heat, I’ve found that cooling pillows and a fan at night help a lot, especially when I wake up sweating. As for staying awake, I get the same thing, feeling tired no matter how much sleep I get. One thing that helped me a bit was focusing on staying hydrated and making sure I’m eating enough throughout the day. Sometimes dehydration or low blood sugar can make things worse without us realizing it.
Also, have you looked into possible sleep issues like sleep apnea? It could be worth discussing with your doc, as they can mess with your rest without you knowing.