It sounds like your memories are starting to reveal themselves in incomplete "pictures" so to speak and the results, or lack of a bigger "picture", is causing you to feel negatively..
You spoke about feelings of anger, frustration and agigtation at unexplained random moments but what feelings are you experiencing when you directly recall any memories?

Hypnotism is often a good tool for recalling past events that our subconcious has hidden due to trauma. If you are prepared to find out about your past it may be worth investigating- but please ensure you are prepared and have a good network of support to help aftewards.

(((hugs)))