Paranoia can be a symptom of many MI such as Schizophrenia, Borderline Personality Disorder, PTSD and Bipolar. What other symptoms come alone with it? That might help you sort out what is going on. I have had paranoid from PTSD, BPD(I used to have BPD) and Bipolar. It is similar but other symptoms go alone with each MI. Hope you find some peace soon.