I was only ever prescribed Motilium and initially tried it in tablet form but like Metoclopramide and other oral anti nausea drugs it made me vomit immediately. Ironic really! The suppositories bypassed the stomach and were so efficient at dealing with the vomiting and nausea. There was no public declaration when they were discontinued, they just became difficult to get hold of, then they were gone!! I later saw info indicating concerns about heart health with some older age groups.
Nausea is a curse, I used to sit on the tube nibbling crystallised ginger with a carrier bag at the ready. Very nasty, I really feel for you 2cats!