I've taken Metformin for over 20 years I remember that I had tummy troubles at first, but that went away after a couple weeks. I've always been an insomniac, so no difference there. I hope your husband gets used to it.
I was started on Extended Release and took that for a couple years. Then the pharmacy switched me to the regular formula because my insurance company stopped paying for ER. Since my body did better on ER, I went to my doctor and got my prescription switched back to the ER formula (and my insurance now pays 100%). Each time I swiched from one formula to the other, I had temporary tummy problems.
* A woman is like a tea bag. You can't tell how strong she is until you put her in hot water. *
- Eleanor Roosevelt