How do you cope with exhaustion?

So I will be 38 weeks in two days. Lately I have been so exhausted I can hardly walk without feeling like my legs are going to give out. I was cleaning out my kitchen cabinets and my arms felt like jello and it was hard to lift them after five minutes. I'm also very hot like I have a fever (but I don't) or it feels like I've been working out and I'm about to pass out. I'm so sweaty and I'm inside with the air on? I have to sit down after being on my feet for 10 minutes. This is my second baby and I was NEVER this exhausted with my daughter I was walking doing yard work and everything at this stage with her. I can't imagine just walking to my mailbox it's so bad! I feel terrible like the laziest person in the world. It gets worse everyday. Does anyone else have this issue to this extreme? Does this mean labor could be soon? Or has anyone went into labor soon after feeling like this? Thanks in advance! Curious to hear all your stories! Also I am a bit worried about how I will have the energy for labor if I'm already this bad and have no energy just daily, I'm not even working I can't imagine trying to work now I know I'd pass out. So big shout out to all the moms working this far along!