Why am I troubled by the strangest things?

I don't think it's OCD, but I get really worried about the weirdest things. Here's an example: I have a really cute makeup bag, but it's small. I recently bought a Claire's makeup kit with eyeshadow, lip gloss, ect. It holds my only eyeshadow, but it won't fit in the makeup bag. It really bothers me that I can't just grab the bag when I'm traveling, and that I have to carry the kit separately. This has happened to me on different occasions before as well. And it's not only making me worry, it's making me physically upset. I can dwell on this for hours, and my stomach starts to hurt because I feel so disorganized and troubled. I really wish things like this wouldn't get to me because I know they're not important, but I just can't help but feel this way. Any ideas of what may be wrong and how I can overcome it?