It's not that absolute. Sometimes there is a single symptom, but oftentimes there is more than one symptom. There are characteristics of the symptoms that make them more - or less - likely to be temporal lobe seizures. The other thing is that having been diagnosed with psychosis/hallucinations, you can have BOTH. In fact, a brain that already has something going on (like psychosis/hallucinations) would be even more likely to be prone to the kinds of brain irritations that cause seizures.

So as for your having more than one modality, it's possible to have more than one symptom that is related to temporal lobe seizures, and it's just as possible to have a combination of temporal lobe seizures along with hallucinations related to a psychotic disorder.

Another thing about these kinds of seizures is that they can wax and wane. There can be a period of time when there are a lot (for example, during a stressful period at work when you're experiencing a lot of sleep deprivation). Then there can be periods of time when they seem to subside for a while. So in my experience, it is more common for them to wax and wane than for them to be regular and frequent.

Another thing to know is that the only temporal lobe seizures that will show up on an EEG come from the lateral surface. Deeper temporal lobe seizures (like olfactory that usually comes from around the uncus) would be VERY unlikely to show up on an EEG, even if having a seizure while the EEG is running. During most EEG's, we are looking for what we call interictal abnormalities or discharges. For a fair number of people, even if they aren't having a seizure, subtle abnormalities can show up during an EEG. To give it a fair chance, the EEG needs to last a good 45 minutes, and the person must be sleep deprived and then allowed to get drowsy and fall asleep. Drowsiness and early sleep can be ripe for abnormalities that don't show up when the patient is awake. Anyway, that said, not all seizure disorders have interictal discharges. A perfectly normal EEG does NOT rule out epilepsy. If the symptoms continue and nothing was caught on a routine EEG, standard practice is to then order a long term monitoring in an Epilepsy Monitoring Unit. It's a hospital stay that can last anywhere from a day or two up to a week. The goal is to capture an actual episode of symptoms. Another way to evaluate if symptoms continue is to go ahead and prescribe medications useful for temporal lobe epilepsy, and then see if the symptoms disappear. That can lead to a formal diagnosis of epilepsy, because the only other option would be to do a grid placement of electrodes on the surface of the brain.

Anyway, I hope you get a well done EEG, and I hope that neurologist you're seeing reconsiders his absolutes about epilepsy.