That's a tough situation but it's seems like you've thought things out and have made a choice that's best for you and your health, plus thought about your kids and husband as well. Not many people can divorce in a gentle way.
Glad your tank is perking up! To get the plug off, sometimes depending on the coral, they can be naturally attached to a small rock and the rock glued to the plug, in this case, you can usually break off the rock from the plug with bone clippers, or sometimes the coral has grown over the plug to and you have to cut the stem from the plug. Either method requires force and good clippers. These are the ones I use but they make them bigger also. Or in a pinch you could use wire cutters. I think bigger ones gives you more leverage and use less force, but I'm cheap and mine are still working.
Some plugs are tougher than others, be careful. I just broke an acro the other day trying to get the stem off. It can be tricky but experience will help.
Cut here, the back, for removing the stem. Not all break flush either, but gluing should still be fine. I use a little ball of putty and glue for mine.