I'll answer you now Nadine
I have had a dream that portrayed me as being OCD but it was funny, not scary (The dream that you first described WAS scary) My dream was of me with a girl from my course in college. We were together holding hands and kissing each other at a fair that was inside a building. The building was enormous and was a network of large tunnels. I began showing some OCD tendencies in the dream but they were humerous and only served to bring the girl and I closer together.
My dear, embrace the wondrousness of your dreams for, as you said, they "are really powerful [and] it can really feel like you have visited a different world". You should still read the Dream Dictionaries but have a different outlook in your mind while reading them.