I'm sorry you are feeling so upset. It sounds like there are lots of stressful things going on for you at the moment, and the bunny rabbit mischief that you describe must feel like the last straw. The peeing on the bed is infuriating of course, and its 's frustrating to clean and sort out each time.
I know you have very limited funds, but I wonder if the cheapest 'solution' to that for now would be to buy a waterproof mattress protector? You could leave it on the bed over your duvet and pillows etc, and you could get a fitted one so that it stayed on relatively securely. You can also buy ones with a towelling type feel on top, so it would mean you could sit on your bed comfortably, without it feeling all horrible and cold/slippery as it might with a shower curtain or similar. (Bunnies wouldn't be able to chew/dig through it as easily either)
I have a house rabbit that does the morning wake up call, relentlessly, until I get up - no matter that she knows she's 'not allowed', no matter that I have been known to growl at her to 'shut up', no matter even if she has plenty of tasty food in front of her, or unlimited space. She doesn't want food or space or anything special, she just wants me to 'be' with her. And over the years I've chosen (through gritted teeth sometimes!) to take it as a compliment: she wants to hang out with me, and can't understand why I would have anything more pressing to do. Some days, of course, I am in a rush and I don't have much time to really acknowledge her until the evening. I notice such a difference on those days - she will be withdrawn and she'll hide herself away in her house. On the days I am able to just be in the room with her - not necessarily stroking her or being 'in her face', just peacefully sharing her space - she is transformed: she'll come out from her hiding place, stretch out in the middle of my floor and snooze, sneak up and give me the occasional nudge on the leg and so forth. It's subtle, of course, but it's like the whole energy in the room changes, if that doesn't sound too bonkers!
So, along with the fitted mattress protector idea, my other suggestion would be to just spend some time in the room with them. Could you do something peaceful like reading or colouring? Perhaps you could make them some little toys out of toilet roll tubes and other household things. Hide some vegetables in their hay, or just sit on the floor and let them come and take snacks from your lap.
It sounds like your bunnies love you and I definitely don't think they understand how upset they are making you. I hope you are able to get some sleep, and that their cheeky little faces in the morning go some way towards you forgiving them their mischief!