It could very well have been just a sign your body was 'tired' from the cold itself. However, I always check the boxes of cold medicines before using them as some will say not to use them if you are taking any AED's and other various types of medication.

You should check with your doctor and see though, seizures happen due to many reasons, sometimes without reason at all. For now, I'd check with your doctor and get a prescription for your cold that they are sure you're able to take if you're on any seizure medication or prone to seizures.

Hope you're feeling well soon!

-Ellie