Can these be olfactory flashbacks?

Olfactory triggers: The sense of smell is deeply connected to memory and is ofter a trigger for traumatic events. In nature, the sense of smell is a survival mechanism. It can be an alert for danger or safety.

People do get : Olfactory flashbacks following traumatic events. You don't describe what you are experiencing, but it is possible. You may want to speak to a psychologist specializing in trauma to deal with the flashbacks. Feel fre to ask additional questions if you need to.