I'm so encouraged to read your posts Jodz. You really seem to want to sort your levels out, but recognise that this will not be easy.
Fortunately you seem to have people around you who can help/support. Without doubt, if your BGs are running as high as you suggest they will be making you feel grim, sluggish and desperately tired., Any small improvement will most likely repay your efforts both in terms of your long term health but also in how you feel day-to-day.
Don't be discouraged if you get a few (or lots of) high results. There's no such thing as a 'bad' test result. High numbers do not make you a 'bad' diabetic, they just give you information as to how your system responds to various things, and provide clues as to what to do next time.
Take it one day at a time and try to improve gradually (much easier on your system than a sudden change). Just work at dropping your averages gradually and identifying any patterns/challenges with hypos or post-meal spikes. Writing everything down can be a real help with that and isn't anything like as annoying as you might expect - especially if you find you can use your notes to make changes. If you're a bit techy there are phone apps/online tools to help.
Good luck and look forward to reading your posts.
M