I don't understand the metoprolol. ???

It's too bad you inadvertently disrupted what was working. Personally, as a person with intermittent and unpredictable insomniac tendencies, I avoid using anything except melatonin or other low-grade sleep aids that Webber and Jaimeson put out to pharmacies, and then only twice each week. I don't lie awake all hours of the night, but I do awaken inside of 4 hours often and find that 3-5 mg of melatonin taken at bedtime often makes the difference on the nights I feel I really do need to catch up some.

The only other sleep aid I have been prescribed, and that was for general, low-grade anxiety after surgeries on my heart, is zopiclone. It was hit and miss. Like all such aids, the first night is a shock to the system and it performs well. But if you repeat, or run three nights in succession, your body seems to learn to resist it. That is why I 'suffer' three nights out of every four before I will take another 3-5 mg gummy of melatonin. I want it to retain its effect, and I know that successive nights will just undo that effect..................for me.