It sure sounds like you're doing this all on your own. You have two relativly healthy kids (right?) and another adult (DH) that should be able to take some of the burden off you. It sound like you just take charge (probably cause you've had to) of everything and don't deligate or ask for help from your family. Some times people get so caught up in thinking they have to manage everything, that they push people away that want to help, or don't realize they need help. Beer won't help, though it tastes mighty good!
Your DH is a grown man and should be able to manage his own pills and should monitor his own activity.... (perhaps reminding him that you really need him around would help). Perhaps he could help your daughter manage her meds as well, if she can't do it herself. To help take some of the burden off you.... what would happen to your family if you suffered a heart attack too? They need to step up and help.
Please don't take this as criticism, I don't mean it to be. I feel bad for you, I know I couldn't deal with a special needs person, so I admire your strength.