Rep97 a flashback is when you are literally reliving something that has happened to you. flashbacks can be about good things or traumatic things, flashbacks happen when something in the present reminds a person of something from the past......here is an example of a flashback. Im going to use a positive event so as to hopefully avoid triggering anyone....

one day I was sitting in the park looking out across a lake. I heard a dog bark. when I turned to see the dog I suddenly felt strange and instead of being by the lake mentally I was now experiencing the memory of walking down a busy street. I could hear the traffic, see the street sign, see the vehicles, I could smell the stale smell of french fries from the mcdonalds I was standing in front of in the memory, and in the memory I was reliving a dog in a car was barking. Hearing the dog bark at the lake triggered my brain to remember being a child standing along a busy street where I had experienced my first mcdonalds and a dog barking in the car nearby. it was just like it was happening for the first time.

we cant diagnose what is going on with you, because thats now what we do here but I can tell you that when what you posted above happens to me my treatment providers call it an anxiety attack, a panic attack. sometimes my panic/anxiety comes with other feelings like paranoia, guilt, shame and other feelings too.

to find out what these problems you posted about are with in you, you will need to contact your treatment providers. they will be able to diagnose and treat these symptoms you are having.