@DaughterDrowningInJunk
I have made myself really ill eating stuff that doesnt agree with me. On Friday I ate 2 babybels at work because I was so hungry (I don't usually eat anything between meals). Cheese does not agree with me. In fact the only dairy I can eat is yoghurt.
Please don't do this! 
Please eat food that you like. If you eat stuff you don't like or makes you feel ill, it's a sure fire guarantee that you will quickly give up.
I think it might be a combination of simply eating too much and dehydration due to reactions to foods
Not really sure why you're over-eating, or why you should get dehydation, unless you're suffering from rampant diarrhoea - in which case, again, stop eating food that doesn't agree with you - and stop eating when you're full!
I'm really sorry that you're feeling so awful, and I really don't want you to be poorly! But surely you can find a way to eat low carb/high fat food by choosing foods that you like, and that don't disagree with you?
Thinking about breakfast, you don't have to eat yoghurt or eggs. Eat anything you fancy! Breakfast isn't a different meal from all other ones; it doesn't require special foods. Just treat it as another meal.
I know I should weigh myself but seeing that I have put on loads of the weight I lost will send me over the edge. I know how stupid that sounds but I am barely coping with life at the moment. I threw all my fat clothes out and I am going to have to go by how my now clothes feel.
I'm really sorry to read this. Can I suggest that you simply don't weigh yourself? It's not obligatory, and in fact judging progress by the fit of your clothes is a much more tangible way to do it. I wouldn't want anything we talk about on Bootcamp to make you feel even worse.
Sounds like you're having a tough time, and I would hate to think that Bootcamp is making you ill, either mentally or physically 