I get this a lot
I talk to my therapist all the time about how if I experience something when I'm alone I have no idea if it's real or not
or even when I'm with others I hear people say things that they might not have said. and you can't exactly ask all the time and still have friends lol

I use my phone to record or check boby to see if he is reacting. but even then it's not foolproof

it's very difficult to accept that I can't distinguish reality from my illness. it's probably the worst aspect for me