Heya,
Sorry to hear Robbie has gastroentritis - but pleased to hear it's noting too serious or sinister!!
Poor little man, he just needs lots of mummy cuddles, i know it's hard (i'm a sucker for sleeping downstairs with Roux at night whenever's she's been ill, and i'm sure i'll end up doing the same for Indi when he arrives!
) but i bet tomorrow morning you will start to see the odd wag of a tail, alothough he will prob be feeling very weak due to not having eaten he will surely be feeling a little happier
Really hope you guys have a settled night with him, try not to worry
Sending big hugs and get well wishes
xx