I had to make myself REST! I had very little appetite. Stay hydrated. I would do a few things and then lie down. I had Covid last August and was tired all the way through November and then I got better. This was a different exhaustion. Sometimes I would nap during the day. My heartrate stayed high for a couple of months and then it came back down to normal. That was tiring too. Sometimes the hardest thing to do is rest, but, rest is healing with Covid. It takes time. God bless you.