Ditto the advice above. Speaking as a parent, there’s nothing easy about having your child leave but it’s also a huge win! It means I’ve done my job raising him and he’s now strong enough to go out and conquer the world. Ok, so he’s only learning how to at this point, three hrs away at college. Did I cry when he left? Oh sure. But I also celebrated because I want him to succeed! I’m saying this because I want you to know that, even if it’s hard on all of you, it’s normal and healthy for you to take that next step.
As for returning for visits, see if there is a public transportation option such as the bus because that would allow you to rest. It sounds like you are carrying the weight of the world on your shoulders and I hate imagining you adding all that driving stress to your plate!
Best wishes!