I realize that you do not want to take medication. Many people feel the same way. They don’t like the side effects and medication alters their personality. However, you are experiencing serious symptoms that are disrupting your life. Hallucinations, if left untreated, generally become worse. The risk is that you will experience a full-blown psychotic episode. You don’t want to take that risk.
Medication may be necessary but only temporarily. It seemed to have worked for you before, to the point where you no longer needed it. You may have to repeat that process.
Another option to consider is taking a low dose of medication or a different combination of medications. All of these options should be discussed with a psychiatrist.
You have to deal with the reality of your situation. Yes, medications can be unpleasant but they have a proven track record of treating your symptoms.
You are also experiencing flashbacks. One particular treatment that many people have found to be effective for reducing flashbacks is eye movement desensitization and reprocessing (EMDR). EMDR is a form of highly structured psychotherapy that is used to treat symptoms associated with past traumas. Hypnosis may be another option.
If you choose to pursue either option, you may want to consult a specially trained trauma therapist. Perhaps your current therapist could assist you in deciding whether or not those treatments would be appropriate for you. Please take care.