not drinking U/D March 7th and hopefully last

my bunny isn't drinking, how can I get him to drink again.

LOL sorry, my wife rushed the message and was very detail-free LOL
He is 6 months old and he has never been a big drinker, but now it's 2 days that we noticed he hasn't drank anything. Moreover he isn't even getting out of the cage...before he used to jump out immediately. I even put it on my water bed (he likes it) and very weird he just lied down next to me (watching me fighting to stay awake).
Change in diet? yes, but more as schedule (except we added radish in his salad). Earlier I used to put pallets and salad together at noon. Now in the morning when I come home I add fresh hay (not a big hay eater either unfortunately), at noon he gets his 5-6 veggie salad and in the evening he gets his pallets. I don't give my bunnies many treats, at most 1 carrot or 1 yogurt drop a week. Yesterday I tried to give him also some pineapple in case he has some hairball bothering him, to help him get rid of it.
By the way in case you need to know the salad is usually made of: kyle (spelling?), bok choi, parsley, radishes leaves, cilantro. Don't know if it help, since I got him, his urine has always been a reddish color, but I read online that in rabbit it can happen.

(Anyway as soon as it opens, I will give a phone call to the vet too. He was nutered about 10 days ago, I think too long to have some bad reaction, but I want to check with him anyway).

Yes he eats and poops. Actually yesterday I was keeping him with me near the keyboard to try and cheer him up..he also peed...how if he doesn't drink?

Not yet today...left a message for the vet, he'll call me as soon as he gets into the clinic.

What a worry for you, but he needs to see the vet, if his digestion slows down, dehydration can send them into GI Stasis http://www.bio.miami.edu/hare/ileus.html which can be really serious if not caught in time.

I hope he's going to be ok, keep us posted, and lots of vibes for BunnyBoo.

The appointment with the vet is in 2 hours. Meanwhile the nurse gave me a syringe and told me to give him some water. I made him drink...to me he looks between scared and sleepy (almost looks like he is sleeping all the time).