What Causes Weakness In The Left Arm Along With Dizziness?

I ve had several tests to find out why I ve had a couple of collapses, I get a heavy, weak left arm, and often get fuzziness in my head which coincides with the feeling I ll collapse - it s similar to dizziness but worse and feels heavier, if that makes sense. My MRI showed two white patches on either side of my brain at the lower part I think. It all started with my left eye getting strange vision problems. It would feel like it s twitching and I d get like this under water visual thing to the left of my vision area. That continued for about two or three months then I noticed that my arm would get very heavy and drop. I ve had trouble picking things up and when I have a dizzy sensation I can t make my hands work. I dropped my purse, had to lean on a wall to stop falling over and I couldn t pick up my purse. My hands wouldn t work. The doctors haven t given me any answers except they want me to see a clinical physchologist! I suffer from very high blood pressure and have vaso spastic angina which I m being treated with beta blockers and bp meds. Any ideas. They haven t looked at MS - that was suggested to me by someone.