First thing I can say is "do not operate heavy machinery". I don't.

What if you try to write it all down. Walk with a pen and paper (pencil and smartphones can be erased) and log your interactions. Then ask people you trust to review these interactions and find a trigger for the illusions.
You can also ask them to write the review (day/hour/real or not) in a separate book that you will never ever write yourself. This will further prevent an "illusory review event" that compromise the data gathering.

Don't take me too serious thou, I'm not a doctor, I'm a engineer... I'm not diagnosing, I'm "bugfixing"

Once you have enough data, show it all to your therapist and try finding a common cause for those odd moments. Better yet... the brain has some method to separate real memories from imaginary ones. You may want to explore if it's not just a matter of yours not being able to tell the difference when both are committed to long term memory, thus giving you the impression that some thought really happened. If you can map your real memories from the made ones, maybe a catscan could show something when you try to recall both in detail.

hope it helps