First off, before I forget...keep a camera with video, charged and handy at all times. This goes for everybody. It helps when talking to your vet or a specialist for them to see what is really going on vs you trying to explain it to them, so if you can...get it on video for documentation. With that being said, here are two of Vegas's "circle turning" videos. He started doing this right before a seizure about 8 months ago, then he stopped. It is a sign of increased brain activity...and so is what they call "fly chasing". Vegas will also sometimes sniff the ground right before a seizure.
In these two videos, a very small seizure followed. I tiny bit of facial twitching. I would definately get it on video and consult your dr. He may suggest seeing a neurologist and they might want to do an MRI to rule out any brain lesions...I'm hoping it is just a reaction to the pain meds...but I've never heard of that happening. Usually 36 hours after surgery all is fine. The bulldog breed has such a high tolerance to pain...they are usually almost unstoppable by now. Atleast Orion was...but I'm thinking she's not normal. I'm going to google this and see if I can find out anything else....