I am hearing you and that exhaustion is the worst.
Take the time off work.
Can you ask your husbands friend directly to stay elsewhere for a bit?
You might need your car plan to have a few good cries. Then, Instead of your car, I have found that hotel lobbies are great. They are usually nice. They are not bothered if you hang out there with a drink for a while. Soda and lime is cheap as chips. Get a book and sit and read or people watch. May be a short funny book and then I strongly recommend ‘Fair Play’ by Eve Rodesky. I saw it mentioned in here and it was a game changer in terms of my understanding of why I was so burnt out. Then see if your H will read it.
Then I think you need to do some serious thinking.
Do you and your husband get the same amount of leisure time and self care time?
If he is working in a paid role all the time, that must mean you work AND provide domestic and childcare labour when not in your paid job. You are likely doing the job of a nanny, housekeeper, cleaner, cook and laundromat. All of which, if you weren’t there, your H would have to either do himself or pay someone to do it.
Women have been sold that being able to work and own property is equality yet we still end up taking on the lions share of the domestic labour because there is still patriarchal ideas embedded within us and the men we marry.
The younger years are gruelling and there is no wonder you are feeling burnt out.
Good luck and take extra good care of yourself. Your needs matter too and they need to matter most to you because nobody else will prioritise them.