Hi
@Johnjoe13, you seem to have come a long way in a very short time - well done you for all your efforts. There's a heck of a lot of information that you're having to take on board just now, so perhaps take it a bit slowly and try out only one or two things at a time. Particularly with Christmas coming up, maybe cut yourself some slack till into the New Year, and learn as much as you can in the meantime, practice testing different food and how your blood sugars respond at various times, as mentioned in other posts above. Then perhaps get down to brass tacks in earnest & work at finding the right foods for you that result in reducing your blood sugars. Don't forget about all the info in daisy1's post - including the low carb programme, coz that could help you a lot, and you won't have to think much about "what foods shall I try". You could also take a look here:
https://www.dietdoctor.com/low-carb
As for breakfast, sorry about the banana and porridge not being a good option for your blood sugar levels. How about good old bacon & eggs in true Brit style; add some grilled toms and mushrooms - will likely fill you up for the rest of the day