Paranoid, Weakness, Disorientation, Lack Of Immediate Memory, Anxiety, Panic, Delusions. Zyprexa Taken. Advise?

Hi, I am Christopher and in the past I have had paranoid feelings that people are watching me or that they can listen to me by a bug or cameras etc. I have had a couple of times of my life when I thought that I was being poisoned by toxins or radiation or something in my car or at my desk when I used to work as a computer programmer. I really feel the sensations and feel weak and disoriented with loss of immediate memory. Recently I have this delusional thought and I was on zyprexa in the past for maintenance. I noticed that one time when I had the delusional episode I was prescribed risperdal and the feelings went away but I developed anxiety disorders and panic attack. I still think that maybe the people that are trying to harm me might have just taken away the toxins or devices that were trying to harm me after they knew that I was on medication.

I tried to take zyprexa 7.5 mg for a couple of days but the sensations are still there. Do you think if I took risperdal like I did in the past is the right thing to do since the zyprexa does not work, I also have stuffy nose from the risperdal but it is tolerable. I am afraid that I might have the panic attacks again and the zyprexa controls that well.