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Hi, Welcome to JustAnswer. You're through to Dr Chris, a small animal Vet based in the UK. I am reviewing your question and will get back to you shortly.
Given the symptoms your describe I would certainly recommend getting him seen by your vet today. I would not wait until Monday. A sudden onset seizure which he is not recovering from could be quite serious and lead to a prolonged state of seizure which could cause him to pass away if left untreated. If you call your vets usual number they will be able to put you through to their on call vet or out of hours service.
I hope that answers your question? Please let me know if you need any further help or advice. Feel free to keep me updated.