Complicated problem... please read

hello

these forums look so empty but they're the only place I found that deals with my problems.. so i hope some1 hears the word..

I have a weird problem in socializing with people. Sometimes I really socialize well and talk spontaneously and all, with guys and girls. However, my mood can flip in a fraction of a second where i find myself no more able to socialize as effectively. It is really really hard to explain. Mostly these behaviour shifts take place between days. For example, at my work, I find myself (due to my attitude) sometimes attracting girls to the point that they come and talk to me. The next day, I'm different, I try to talk to people (guys and girls again it doesnt matter) and I can clearly see how fast they will try to end the conversation just to get away. I'm so confused as how can the yesterday me be the same as the today me... I really do NOT know... I seem to have inability to go deep in a relationship with some people, GUYS OR GIRLS. My problem is NOT social phobia as I usually tend to make a good impression on a first encounter, but after that encounter, my relationship with that person stays at that lame 'official' kinda level; restricted to work and saying hello. Can anyone please help tell me what's wrong with me? When I get home I seem to get back to my normal joyful self. Is this normal? I guess not. Is it related to food? sleeping pattern? help me...

Well, I can't help you i'm afraid, but I get something very similar to this