Joan, the only idea I have is to explore the possibility of seizures. This requires a work up by a neurologist.
Another hopeful avenue is to continue to explore the role of stress with the great psychiatrist you have. It is amazing how stress effects the mind and makes whatever is going on much worse or more intense. You might start this by using the MasteringStress program(link above), list and work on your stressors and triggers, and then take the printout from the program to your therapy session.
If you try this approach, please be sure to let me know how it works out for you.