It depends on me

Am so exhausted. Have been spending a week's vacation doing only things for children. It's been joyful, and I'm so happy spending time with them. But oh so tired now.

My ADD ex husband has had very low energy for years. I notice now in my week I've squeezed in several weeks' worth of child activities, hosting their friends, researching and preparing new activities, in order to compensate for the passivity I suspect will await the children in his house.

Midsummer's Eve tomorrow, no children, I'll be spending it helping a friend who's in the middle of divorce and isn't doing very well. I feel bad because I have another friend who was to be alone tomorrow, after having turned down a party invitation, and despite now having settled for celebrating with yet another friend they seem to be sad I'm not going to spend the day with them. They haven't invited me or suggested anything, though. I just sense their disappointment. 

I'm exhausted. Even when over functioning I never feel enough gets done. Not to meet the needs I see. Especially not to make things happen that nourish me and make me happy. Around me is knee-deep passivity. I'm terrified of its effects. That's why I battle it with all I can muster and wear myself out.

How did I end up this way? I feel ashamed that I haven't been able to change anything in spite of voicing my needs to friends and family and trying to make boundaries. ADD has almost destroyed me. Why would anyone assume I can take on more? Newly divorced? Battling situational depression? Hardly able to work? Multiple stress symptoms?

Why does everything seem to depend on me alone?