Hi Hearty,
Coud he go shopping with you and entertain Delilah while you were in the fitting rooms or something? I actually prefer taking Alistair clothes shopping, alone, though, and he's usually fine to watch me in his stroller, especially if I put him in front of a mirror. However, I understand shoping isn't the real issue here!
It's really too bad that the surgery happened when it did...but at least this way, it's over and done with and will suck for a month but when Tim's recovered, you won't have it hanging over your head anymore. You will know it's done and dusted. The next month WILL be hard with no help, though! Can you perhaps hire temporary help with the housework or cooking? I know there's nothing that can be done in the middle of the night...and believe me, there were plenty of nights I'd be up breastfeeing Alistair and listening to Alex snore and feeling annoyed! Alex never had to do the middle of the night thing because by the time I stopped BFing Alistair slept through the night. Anyways, if you do end up getting more help, I'd make sure Tim is the one to organize it. Is there anything he can do with one arm that he can help with? Feeding Delilah a bottle, holding her and rocking her to sleep, etc?
I'm so sorry about her diarrhea. So you stopped the fenugreek and it's still going on? That's quite a virus.

I'm happy she's not dehydrated...I wish there were something you could do to firm up her poops! I found Alistair's poops were always runny (breast milk poops) until he started eating solids. But at least the breast milk poop doesn't stink! What kind of diapers are you using? Have you tried night diapers to avoid leaks in the middle of the night?
Anyways, sorry I'm not more helpful with the advice. It sounds like you're doing everything you can. Hang in there....it will pass. Everything with a baby is a stage, and blink and it's over; at least that's how I felt. I know Tims' surgery isn't technically a 'stage' but I guess you could look at it that way.