...been thinking about this colors.. (rut roh)...

I've never considered "flashbacks" to be a desireable entity. Good memories, fondness etc, yeah... Your use of the term flashback might encompass all that, which is why you also said you can't control them lately. Flashbacks in the truest sense of the word, are not controllable.

Regardless of the wording, I feel for you, and understand how terrible these make you feel. I hope you are able to get a handle on things soon.