is this psychosis or something else?

hi i have been getting brief episodes (that lasts 4 hours up to 24 hours?) where i am scared and frightened of several governments and people are trying to kill me as i know more then i should to the point i have installed video cameras and i am nearly constantly watching them out off fear i also get a feeling like there watching my every move and that i am in danger to the point of considering getting a better weapon the i currently have i have also seen people out the corner of my eye watching me waiting for me to drop my guard so they can strike i haven't left the house since Saturday when i went to church with someone i know i only trust three people at the moment and even then i am frightened if i tell them they will say something and i will end up dead it has even prevented me from sleeping sometimes as i am to scared to and when i do a sleep with a knife under my pillow but then i will come back to normal for anything up to 6 hours then back i go into that state I'm also aware of the thoughts and feelings i had during the hours of fear and i feel stupid and that i am weird my question is this psychosis or something else i thought i would ask given for the last two hours i have some clarity and i am not sure how long it will last so i thought it's best to ask this question now before i end up going into another episode