Is it normal to have a childhood fear in adulthood?

When i was five, my parents made me spend the night at my grandparents house that was quite aways away from my parents home. I didn't know these grandparents very well and they suprised me with the fact that I was spending the night as they were leaving. I was frankly scared out of my mind. I started crying and screaming that I wanted to go home but they didn't let me.

Heres the worst part. I ended up throwing up while I was there. Ever since then I've been horrifically afraid of throwing up and of staying places away from home. I was afraid to stay away from my parents but I kind of got over that facing my fear staying at a couple different friends homes. I then ended up buying and moving into a home that's about a block away from my parents house. The only way I was able to live on my own is because my closest friend moved in and she's renting a room from me. I feel safe in my house now as long as I don't have to stay here alone. The thing is, I'm still unbeliveably afraid of throwing up and I still won't stay with other people. I've conquered alot of it but not all. I don't know what to do!

The sad thing is, I'll be 27 in June and I want to be able to handle being alone. I want to grow up as far as the fears are concerned.

Here are my questions.... Is this normal? Am I the only one that has these types of fears? Please post your recommendations and comments. I know that all this to most is childish, immature and stupid to some. To those of you that feel that way, please refrain from commenting. It's not something I can just turn off and it's something I've dealt with for 22 years.