So what... you had a bad week!! Get it all out of your systen now & start again!!
And if you read the SW book from start to finish... the plan promises to work without you doing any exercise at all!!
An ice-cream is allowed, hell, even a McDonalds is allowed... the main thing is, to just get back on track as soon as you can!
Sorry to hear you're not feeling great & I have no experience of hypermobility and Fibromyalga but I can still sympathise with you there, it must be difficult to get things done the way you want when you are restricted.
Food wise, are you still stocked up with eggs, onions, toms etc... an omelette would be handy for dh to do for you, or a baked potato, even beans on w/meal toast...
Tomorrow is Sunday - you can't go wrong with a big roast dinner, can you???
Listen, you have my num, I'm there if you need me (hope that doesn't sound cheesy - you know what I mean!!)