There's other diagnoses apart from Schizophrenia that include psychosis, and you'd need an assessment by a psychiatrist to confirm what exactly. Depression, some of the personality disorders, bipolar, as well as an illness called Psychotic Disorder NOS. It can also come about when you're under a lot of stress and/or not eating or sleeping properly over a long period of time.
I have a slightly different perspective on psychosis to the medical view, and see it as the manifestation of deep unconscious conflicts that are terrifying to come to terms with, and 'haunt' people, for want of a better word. It's kind of 'split off' and attacks you emotionally. Working through these conflicts in psychotherapy, with the help of medication, as you are taking, to keep you 'grounded' in yourself and reality, can really help.
These articles from Mind might help
Understanding psychotic experiences [link] and
My name is Pete (Young people and psychoses) [link] [opens up again in a PDF if you follow the 2nd link]