I agree with Tonibun, take your rabbit straight to the vet if you think they have gut stasis.
We have a rabbit prone to stasis and always play it safe by going to the vet as soon as we spot signs.
If you do this you can rule out any blockages, administer pain relief and gut motility drugs to help him as quickly as possible.
There are signs which we have learnt to recognise - our rabbit declines food including treats, tends to lie in a certain spot, looks a little sleepy (I think it's his eyes narrowing as it's uncomfortable/ painful). Next stage he starts to belly press and no longer socialises but instead hides away. Worse stage (hopefully we catch it before it gets to this point) he faces the wall and looks a little distant (he's in pain).
My view is that there is no point in waiting or trying things to alleviate the stasis. The longer you wait the harder it is to obtain a good outcome. A rabbit that isn't eating or drinking will become dehydrated which can make the situation worse. Although I know other RU members have helped their rabbits at home with success, I don't have the confidence to do this and would always be wondering 'what if' if anything were to go wrong and I hadn't gone to the vets.
My advice would be :
1. Don't be scared of gut stasis, but know the signs [rabbit stops eating or pooping and/or if they start belly pressing] and treat it seriously
2. You know your rabbit best, if you think they have gut stasis then they probably have.
3. Don't wait, the sooner you can have your rabbit assessed the sooner treatment can start, the higher their likelihood of a good recovery.
4. Be firm (but friendly) with vet receptionists when booking the appointment. Make it clear it is an emergency. Be assertive on your bunny's behalf - get the earliest appointment you can have. I've been offered appointments for 3 hours ahead and have politely declined ('oh no, that won't be soon enough, is there an earlier appointment - rabbits can die from gut stasis, I wouldn't want to wait that long' usually does the trick)
Just to add when it first happened I doubted myself and wondered if my rabbit actually had stasis. I came onto to RU and asked 'what should I do'. The resounding answer was 'get to the vets ASAP!'. I was so glad that I followed that advice. My rabbit did have stasis and the vet was able to help him.
I hope that helps