Hi @Lily4708, From my reading and diabetes education, not as professional advice or opinion:
one very important measure, of potentially like-threatening concern is whether your father
has high ketones in his blood.
If he is very low in insulin in his body he will start to break down fat and that can lead to a dangerous situation called diabetic keto-acidosis. Theses ketones can be measured by a meter simikar to the one' that are used to measure blood sugars with a finger prick of blood. This is different to when people fast and burn off fat - they have a much smaller, lower
Ketone level.
Because of your father's uncertain status regarding his type of diabetes and his very high BSLS and his unwellnes and possibly a dodgy doctor, please seriously consider taking him to hospital, asking for ketone and BSLtests and help. NOW !!!
There are blood tests that can be done to help ascertain if your father is Type 1 or 2, but doctors sometimes delay these as they can be less accurate early on.
But ... your father deserves the best care in the meantime, not these high BSLs and most doctors will not have a clue how uncomfortable high bsls are and seem blase about how dangerous they are for an individual like your father.
In the interests of patient-centred care , and do not be afraid to use that word, you are asking the hospital doctors and hopefully a specialist along the way to look after yiur father's health, before things gey worse.
Metformin can take some weeks to work, if in fact it is the correst treatment and high bsls are not good for health.
That is your first priority, his health, blood sugars, any ketones. Everything else can join the queue afterwards.
Best Wishes and please act now !!