Could be a flashback or it could be a hallusination side effect of skipping regular meds or it could be a drug induced hallucination. Since you were abused, did drugs and skipped meds theres no telling what it was. My suggestion stay off the drugs, stick with regular medication scheduile and then if it still happens then it probably is a flashback. in either case your therapy / meds professional should know what happened that way the situation can be monitored saving you lots of problems in the future.