Letting Go of Paranoia

Hi Everybody - I am diagnosed with paranoid schizophrenia, GAD, OCD and PTSD.

Often I feel like my friends are angry with me because I don't hear back from them soon enough, etc. I am seeing the need to break away from this way of thinking, because it is harmful to my relationships, and unfair to my friends. I am beginning to look at overthinking as an unhealthy habit, like an alcoholic's drinking. I am learning that I need to just let go. Go with the flow. Bend and don't break. Accept that a life of uncertainty is not only okay, but normal. Do any of you have any tips on how to "thought stop" paranoia/overthinking? Or am I expecting too much from myself? Any and all feedback is welcome. Thanks.