Stress Or Stroke?

On 22 march 05 my 40 yr old wife woke up during the night suddenley. She got up and went to the loo and felt her balance was not good. Over the next week she found that she had a tendency to walk to the left. She experienced weakness on her left side and also noticed that she was making more left hand key stroke mistakes on her keyboard. On 2 april 05 she collapsed while in a local supermarket. The local hospital emergency dept suspected stroke. Blood works, mri, ecg, chest x-ray and echo of heart have come back normal. She has regained some strength on her left side and can walk now, providing she has something to hold on to. She tires easily though. Neorolgist has ruled out stroke and says it is stress/ anxiety and suggested counselling and physio. She still has a balance problem - will lean to the left when eyes are closed and doesn't always feel able to move because of the weird balance problem. Any ideas? She is convinced that something must be going on and feels frustrated and annoyed at the diagnosis of stress as the cause of this problem. She admits that she has been under stress but that she felt as though she was handling it. Any ideas please. - worried husband in the uk - thank you