Welcome to the board. I have had Epilepsy all my life, so I know what your going through. Do you get any warning signs or auras before a siezure? Or are you up tight before hand? These are usually good indicators something is coming. The smells and sounds that you are experiancing I can relate to I started having these experiances when I was a kid. They were eventually put down to Temporal Lobe activity so that could be a possibility for your situation. Only tests will be abel to clarrify it though.
If you want to know specific information any one on the board will usually be happy to help, me included.
Feel free to ask and we'll do our best to help.