AFAIK, tramadol does not actually cause seizures; it decreases the seizure threshold. Some types of anti-depressants (including trazadone) can also do this.

IMO, you need to report this to your doctor immediately/ASAP.

If it happens again before you can reach your doctor (I'm no expert) get to someplace where you cannot trip, fall, or otherwise injure yourself. If appropriate, lie down.

I can't comment on discontinuing either of these medications; I'm not a doctor, there is not enough information, and discontinuing either abruptly could also have ramifications. Hence, please call your doctor.

Doc