how to ignore paranoia/hallucinations?

it ruins every fucking high i have, it’s so fucking annoying because i know that it’s in my head but i’ll focus so hard on tiny noises and shit and i keep thinking “what if it’s not in my head this time?” i don’t want to get sober so don’t say that. just please give me recommendations on how to deal with this annoying ass shit because i sawR its unbearable. i thought i heard a police siren an HOUR ago and saw a cop drive by now i can’t stop having obsessive paranoid thoughts.