Ok so the deadline is up to you. The dr can give their advice to you. You listen, ask questions, make sure you understand pros annd cons and decide what you’d like to do.
Using a meter or cgm is also up to you. What he means is the nhs won’t fund it, so some pretend it has no value to you or don’t know how to test food choices in type 2 and see it purely as an insulin or hypo management tool. What is relevant is that if you choose to measure is to understand how and when to do so and what those readings mean. Otherwise a series of random numbers may be of no use or maybe even worrying (what the drs often claim it will be). It’s pretty insulting of them to assume we can’t learn how to interpret the data though. Better would be to educate us and themselves too if need be!
3.8 when not on meds is fine and what many a non diabetic would have. Diabetes does not have lows as part of the condition. What causes actual medical lows is the medication used to treat diabetes - potentially. The level is set at 4 in medicated diabetics so they have time to act before it becomes dangerously low at levels even lower than that. They are often dropping quickly and their medication overwhelms a humans natural process to correct low levels (your liver adds glucose to the blood).
Metformin will lower averages mostly by lessening how much glucose gets added by the liver because type 2 inherently overdo this. It doesn’t totally block the ability though so it in uncommon cases might dip a little but then recover. It doesn’t actively lower glucose levels in the blood already. It does help us respond better to insulin and use the glucose we have a little better. Serious lows on metformin alone without any other conditions are most uncommon. Averages are not what we are discussing here (that’s kind of, but not quite, the hba1c). We are discussing blood glucose which is a “right now” measurement.
There’s nothing coming to mind - for me - that would mean a 3.8 in a non medicated otherwise well type 2 is “something important”. Not least of all considering pressure lows if you are laid on the sensor and the inherent issue that cgm aren’t so accurate at highs or lows (nothing is perfect) and a low should usually be checked against a meter before you worry about it, especially if you feel totally ok at the time.