Update: Feeling better!

Does the little human give you yucky medicine too, mirror bun?
This is the place Simon would retreat to every time I gave him medicine or force-fed him.  He got progressively closer to mirror bun (and harder to extricate) with each passing dose to the point he attempted to pass through the looking glass by merging with his reflection.

Simon:  If I close my eyes hard enough, maybe the little human will go away.
River:  She's still here.  Hey, little human--you said I could come out and play after you were done with whatever you just did to Simon!

This pic pretty much captures the level of stink-eye River leveled at me for giving Simon medicine (which she discovered the hard way by cleaning his face and tasting it).
At this point, I was very worried about Simon because his ears were feeling cooler than normal (shock).  I set him on a heating pad (LOW setting) and wrapped him in his favorite purple towel to help stabilize his body temperature.

After getting Simon's temperature more regulated, I uncovered him so he could move freely if he wanted to (left the heating pad on low).  River wouldn't leave his side, gave him an ear hug and promptly fell asleep like this for the next hour.
At this point, I had the opportunity between giving Simon belly rubs and checking his ear temperature to review every article and link I had on rabbit GI stasis and bloat.  I was also going through every local exotic vet and emergency vet in the vicinity and ranking them by when they opened and how quickly I could get Simon there if I needed to.

This makes me a happy bunny caretaker!  Simon is eating on his own and has gone #2 (not even mad that it isn't in his litter box).
I had force-fed the little guy some pellet-flavored water (pellets aren't keen on staying in solution) at 2:30am and gave more tummy rubs.  He finally started to look more alert and even started cleaning a bit.  By around 4am I had coaxed him back into his cage and managed to get him to eat a mouthful of oats and some hay! 
I stayed up until 6am monitoring his progress and presenting every type of food in the house that was bunny-safe in hopes of him eating a bit more.  Took a short nap and captured this shot around 10am.  What a relief!
Thank you to everyone who sent their well-wishes!