Stasis is when the gut either partially or completely stops working properly.
Stasis can occur as a result of any number of underlying medical issues and it is most likely one of those issues causing any pain.
The guide below explains more
Digestive Disorders: Not Eating - Diarrhea - Bloat - GI Stasis (No Gut Movement
Hope you have had a successful response from your vet by now

. Just a thought but does your Metacam bottle have a stopper like this (it’s on its side in the picture). If so, it can be levered off so you can then get the syringe into the bottle. My vet gave me that advice! Just hold onto the bottle tightly when levering it off though - the stoppers are tightly fitting
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hi I did reply but can’t see it. Sorry I am not an expert on here. No it’s a different top and they gave me a cat syringe which fits the bottle today, but it leaves some of the med inside, which isn’t great on a 0.2ml dose!