Hi Jayney
You're doing fine!
Things can be a bit confusing to start with with foods you would think as good are actually bad and others you would think as bad being good.
Mashed potato is evil stuff, try boiled or better roasted! In your list of foods yesterday I would say bacon good, mash very bad, carrots and beans ok but depends on how much you ate, muller light ok but better make your own yoghurt from plain yoghurt and then mash in some frozen fruits (any with "berry" in their name are usually ok). Don't eat too much as fruits have sugar. Ryvitta's bad too many carbs to make it worth the effort try Burgen Soya bread instead but don't expect to be able to eat more than one or two slices a day.
Cheese, eggs, oily fish, smoked fish, bacon, chicken, lean mince, cheap frozen mixed veg (without sweetcorn is best I find). I find things like Pataks curry sauces and Dolmino sauce are ok so long as you only use half a jar in one go. I find I cant eat more than 25g of white rice or 25g of green or tricolor pasta in one go. Brown basmati rice I can eat up to about 50g. Potato's are a no no for me you may be lucky! If you like things like cauliflower cheese do that or cauliflower and brocilli cheese with added smoked haddock is nicer! If you're missing a fry up don't! bacon, egg and mushrooms is one of my staples and is very low in carbs so long as you don't add fried bread etc and try to fry it in a little oil as possible.
I base many of my main meals off 250g of frozen mixed veg then add meat and sauces to taste.
I've recently discovered I can eat up to around 150g of fresh fruit salad as a pudding with my main meal without any real consequences. That's made from melon, apple, pear, pineapple, raspberry's
Try and look at the labels on all the food you eat and see how much carbohydrate (not just sugar) is in each thing. To get your levels under control you will probably need to reduce your carbs considerably to start with. Everyone is different and you'll find some carbs are better than others. Many people on this forum do well on low carbs, say less than 75g in total per day others can tolerate double that if not more. The knack is to work out how much you can tolerate but if you can try starting low to "detox" yourself then when you are happy you have got to good levels start experimenting with what you can eat and tolerate.