Becky, you can do it! I detest most exercise passionately, and was last seen 'hopping about' when my grown-up sons were little and I was trying to be 'super mum'.
You have to seriously change/alter what you eat and in what combination. The regime I follow has few rules. Here are the most important ones: Always have at least 1/3 of raw or cooked vegetables with every meal, cut off all visible fat from meats, avoid processed foods because of all the fats and sugars that you can't see, drink plebnty of water. I decided to try the 'Slimming World' system because it allows me to eat plenty, so my energy does not drop - very important in my job.