My husband had viral encephalitis 26 years ago and was bitten by a swarm of insects about 5 weeks ago. Two weeks ago he came down with memory loss, dizziness, headache...symptoms that I remembered from 26 years ago when he was bitten by horse flies. He has had an MRI, CT scan with dye, spinal tap, blood work, etc. and it has shown nothing, and yet the symptoms persist. He also had a head injury when he was in high school playing football and had epilepsy for several years after that. Any ideas?