I don't have any specific advice for you, but your childhood sounds kinda similar to mine. I had some severe problems with maladaptive daydreaming until I was able to find things in the real world that replaced the emotions that daydreaming evoked (not going to say that's easy). I used to have notebook after notebook of written adventures for my imaginary world and I could feel really strong attachments to characters that were only fictional. As a positive it did help my reading, writing, and creativity at a young age. As a negative, all the way up to high school I was that weird loner kid that sat in the corner writing in a notebook. It's how I coped with the extreme stress and sensory bombardments of the environment I was forced to be in.

It wasn't until I went through a five year online gaming addiction, years of therapy, went back to school, and found a boyfriend that it stopped. I found that therapists were only useful for so much. My life got really busy with real world stuff and when it slowed down I noticed I couldn't really daydream easily anymore. So the cure for me was finding real world sources of those emotions I craved (comfort, excitement, love, etc) and keeping busy enough that I didn't need to slow down and imagine anymore. It's not perfect, and I do still daydream but it's not as extensive as it used to be, nor does daydreaming evoke strong emotions anymore. It helps me to fall asleep sometimes if I retreat into a fantasy world and I don't think it's inappropriate to do so. Sometimes I actually really miss the extensive world and characters I created, and being able to conjure up anything in my brain like an in-flight movie, but those days are over for me and I think it's probably a good thing that it isn't so strong. I have real things to worry about now (that is also a good and bad thing).