Olfactory hallucinations treated w AED. Could intense feeling of jamais vu followed by GI upset be another symptom of temporal lobe seizures?

Yes. The seizure aura is different for different patients. A seizure can be followed by confusion, headache, nausea, etc. See a neurologist to undergo an EEG test as well as a full neurological evaluation. http://www.nlm.nih.gov/medlineplus/epilepsy.html.