I have been on several medications for panic and anxiety disorder. But after 3 years of being on one they stop working and I have to change to another one.But every time I change to another one I feel very weird. I get weird sensations in my head when I move around and feel very sick.,even when I 'm weaning off of the medicine and starting a new one. and I'm going through it right now. Has anyone ever had any of this happen to them? Please let me know!