When you say you "had a hypo", did you have all the symptoms of a hypo as well as the BG level of 3.6? If you have previously (ie, before diagnosis) been running high BGs, it is possible to have hypo feelings as your levels come down - ie, false hypos. What was your BG level at diagnosis?
I am not doubting what you say, but metformin is not a hypo-inducing drug, and 3.6 is an acceptable level for a non-diabetic (the range is 3.5 to 5.5 before meals/fasting), so I don't see why it shouldn't be okay for a well-controlled Type 2. I try to keep within the non-diabetic range, and I feel okay in the mid to high 3s. But I was never very high to start with - they caught me early. Many people prefer to go no lower than 4. We are all different!
If you do have hypo symptoms with low blood glucose levels, eat a couple of glucose tablets and then test again after 15 minutes. Two tablets should push you up over 4; if not, have another, and test again 15 minutes later. Once your BGs are rising again, eat something carby - oatcakes or a plain biscuit, and maybe a bit of cheese - to keep you stable. I always carry glucose tablets just in case, but I've rarely used them.
You say you test 3 times daily before your meals. Levels between 4 and 5 are very good, well within the non-diabetic range, which is where I like to keep mine
. You also need to test 2 hours after eating, to see how your body is handling the food you eat. Your BGs than should be no higher than 7.8; if they are above this, you have eaten something (usually carbohydrate) that your body can't handle.
I can only cope with small amounts of carbohydrate, and I like my glucose levels to be within 2 points of where I was before I ate. That is, if my pre-meal test is 4.8, I would like to be about 5, 2 hours afterwards. I didn't manage that initially, but I've now been diagnosed nearly 3 years and things are much better than they were.
There is a thread somewhere on here about hypos and how to treat them. If I can find it I'll edit this post to tell you where it is.
Hope this helps!
Viv 8)