I think you and your fiance have to sit down and make a plan for the next few months and give you a more structured environment and support. What you have now sounds really chaotic and that will cause anxiety in even the strongest person.

I don't know if you do finances together yet or what, but I would try to make it so you each have a couple jobs instead of you having three and he only one and I would try, on your own part, to keep your eyes on your needs and responsibilities only and not worry about his having a job or not, etc. You have to be able to function for yourself or you will be no good for yourself, will be vulnerable to the anxiety going up and down.

Sounds to me like you are working hard and doing what you have to. I would just get it all down on paper; a budget, your plans for work and schooling, how much you need to make and what expenses you have and your hours and ways to use the time between to help yourself -- ways to rest and squeeze in chores you don't want to have to do in other, larger sections of time, etc.