Has anyone taken Symbyax and had involuntary muscle movements that come and go suddenly?

My boyfriend has been on Symbyax for a little over a week and it has worked wonders for his depression and mood. He started having involuntary muscle movements (raising arm, shaking hand, twitching face, can't walk, rocks violently when he sits, etc.) 2 days ago after accidentally taking a medication that he was supposed to take after he ran out of his Symbyax. It was essentially Prozac and mixed with the Symbyax which has the generic form of Prozac in it, he began to hallucinate, became suicidal and looked like he had severe Parkinson's disease for about 5 hours. After the Prozac wore off he was fine. Today, after he took his Symbyax (like he has been doing at night) he started having the jerky movements again and he stutters really bad and shakes his head and moves his arms up and down. It lasted about 30 minutes and then stopped. Then again about an hour later it started again and lasted about 10 minutes. WTF!? It scares the crap out of me and I can't find anything really about this. Please help if you know anything! I really don't want to make him get off the Symbyax because it has already helped SOOOOO much. I'm desperate. Could it still be an effect from the Prozac and Symbyax combination or I also noticed that he didn't eat anything today before he had the episode. He also hadn't eaten anything 2 days ago when he had the serious side effects. I'm thinking it's either the not eating, the Prozac still, or the Symbyax... but I don't know :( I need help please!