I have been stuck in repeat mode in some elements of events in my mind.  It's like I'm trying to hang onto a moment.  I began to be aware of this when this repetition was occurring several times in a short period of time  and I realized I didn't feel better because of it but rather I felt flat.  That was when I began to seriously look at why I daydreamed so much.

I daydream more when I have menial tasks.  That's probably why I don't mind doing them.

I work on controlling rumination when it has a negative impact on me.  I first work on catching myself doing it, then I discuss with  myself the feelings that are involved when I catch myself, then I move on to do something that takes my mind away from it for at least a little while.

@Henrik, I've never noticed much of a difference on my daydreaming or ruminating on anti-depressants.  I'm on one that I feel works well.  I also take Buprenorphine to treat my opiate addiction as I am also a recovering addict.  I take Welbutrin (anti-depressant).  It does help a lot with my depression.  I ran the gamut  of almost all the other SSRI antidepressants to get to the Welbutrin which was hellish but I'm glad I found it.  I function much better on it than off it.  I find that I do still have a strong tendency to think negatively but when properly medicated I am actually able to talk myself  through and out of habitual negativity and into a more realistic perspective.  Depression is alllll about perspective in my case anyway.

I replay thoughts, images, & mostly scenes in my mind all the time.  Some scenes are from as far back as 11 years old that I still have.  Sometimes my mind will switch it up ever so slightly though.

I often rethink/replay/stew over situations that were stressful to me and felt unresolved. I used to daydream having arguments with my ex boyfriend a lot...

Its really true that your past experiences has a lot to do with your day dream. They create lots of insecurities and you can only wish that it wouldnt be the way it was. It surely happens to me.

Hey Amanda, I gotta say I know how you felt . I try to make people happy when I go places. Yesterday I was at a Starbuck cafe. I saw I somewhat distrought girl sitting in a seat and I said to her, "Wow! You're so pretty! I like your hair & makeup!" I suppose it isn't the best of things to try to make people happy for no reason but I can't help it sometimes because I imagine how I would feel or be thinking if in others' position, so naturally I tried to cheer her up! But what a pain, she said, "oh... Thanks but I don't think You should be judging Me. I mean I dress IN this century". I was so greatly offended by her tone I just took my tea and left the building. I mean... I am a lolita and a 'sweet lolita' at that so I do in daily hours dress in collared shirts and greatly bottoned jackets that stretch up to my chin with cuffed sleeves and no hood, so I suppose I do dress a bit odd in comparison to others but I mean - COME ON! I was trying to be polite and nice! Geez- guess I will deny any provocation of kindness next time!