Metformin will not make your BG levels go up. Metformin helps your liver to make less glucose from proteins and fats to meet your metabolic needs, and it causes your insulin resistance to decrease, so that you can better use the glucose that you ingest and that it makes- it makes your cells more likely to take in glucose from the blood- so it lowers your blood glucose levels two ways. (Make less glucose and suck glucose out of the blood.) It takes a couple of weeks for it to kick in fully. Your bg numbers will fluctuate from day to day, so you can't draw any conclusions from two isolated readings with a machine that is 10-20% inaccurate.
Your A1c of 6.1 says that your average blood glucose level is about 123 - anything over 125 is considered to be diabetic. The A1c results can have a variance of up to 10 percent depending on the lab and the machine they use so you could easily be in a definitely diabetic range. You really need to find out what your lab considers to be a normal, non-diabetic level. For example, in my own hospital lab, any A1c under 6.0 is considered to be non-diabetic (but still pre-diabetic)- so if you had your bloodwork analyzed there, your report would say DIABETIC. Most folks without diabetes have A1c's in the 4.7-5.5 range. Their blood sugar ranges from 70-95 with 84 being the median. Yours is higher.
If your doctor has put you on meds and sent you to a dietitian, the handwriting is on the wall. Your wonderful husband is probably trying to make you feel better by saying those things to you. Mine surely did when I was diagnosed and the poor guy had no idea how to deal with the idea of his wife losing her eyesight or her limbs. With diet and exercise, you may be able to lower your blood glucose levels enough to go off medications, but you will always have diabetes. You will always have to manage your blood sugar and it WILL change over the years because our body becomes less efficient at performing its functions as we age- even if we have perfect control over those numbers.
You can help yourself and your husband by taking him to the dietitian and the diabetes classes with you.
Good luck and good health as you begin your journey to better control.
I just want to live happily ever after-every now and then. Jimmy Buffett