Hi Karen and welcome to the forum
🙂
Reading your post made me so angry - not with you, I hasten to add, but with whoever told you that insulin causes weight gain. It does nothing of the sort! There are thousands of slim and even skinny type 1s (many of us on this forum) who have been on insulin for years, if not decades, and who haven't put on any weight at all. Some of us struggle to keep enough weight on!
The thing which causes weight gain is eating too much in order to match an insulin dose which is too high. If the insulin dose is correctly matched to the food you are eating (rather than the other way round) then there is no risk at all of insulin causing weight gain. So please don't fear insulin, or view being put on it as a threat - it is just another way of treating diabetes, and people with very high blood sugar like yours generally feel a whole lot better after they start using it.
As
@Leadinglights says, you can't buy HbA1c machines, but you can buy blood glucose meters which will tell you your current blood sugar level rather than your 90-day average. If you do get put on insulin they should give you one as with insulin you do need to check your blood sugar every time you inject and any time you feel your blood sugar might be going too low. If you want to get one for yourself now though to see how different foods effect you, this is one people on this forum have recommended -
https://homehealth-uk.com/all-products/codefree-blood-glucose-monitoring-system-mmoll-or-mgdl/ because the test strips are comparatively inexpensive.
If you buy it you will need to chose mmol/L as this is the measurement used in the UK, and you will need to get extra test strips with it (you can re-use lancets - you're not supposed to but most people do - but you'll need a new test strip each time). There are a couple of other meters mentioned on this thread too, as well as some other useful links -
https://forum.diabetes.org.uk/board...for-people-new-to-diabetes.10406/#post-938458 (I know you are not new to diabetes, but some of them may be helpful anyway).
You can also get a sensor which you wear on your arm which measures your blood sugar all the time for 14 days - they are quite expensive and normally limited to type 1s, but the manufacturers are currently doing a free trial, so you could have a look at that and see whether you think it might be useful for you (you'd need the right sort of phone to scan the sensor) -
https://www.freestylelibre.co.uk/libre/free-trial.html