I can only totally concour with my learned friend
@COYBL25 I too have a close friend whose wife had a total mental breakdown and attempted suicide, she too was sectioned, he was trying to balance his responsible job with bringing up his family and dealing with his wife's situation which tested his resolve.
That was some ten years ago and there has never been a repeat of that dark period for them.
I know there was a short time where they were getting the right balance for her medication, once that was sorted they haven't looked back and they have recently become proud Grandparents.
Mate, don't reproach yourself, you've done what you think is best for your good lady because you love her and want her to get better and you have to believe that will happen because it is fixable though you may not think that at the moment.
Mate, continue giving her all your support but look for support for yourself also if you feel the need, probably your doctor would be able to put you in touch with a support group, we have an Andy's man club locally which is gaining a great reputation.
I hope all goes well for you and your Mrs and you know there's lot's of good people you can sound off to on here and also receive good advice from, please keep us informed