Should I be afraid?!

This weekend I was staying on 30-A when I looked up off the porch to notice a "thing" hovering above the trees. It stayed there for about 5 minutes then flew away faster than anything I've seen. I rushed to tell my wife, who wouldn't believe me. The thing returned about 10 minutes later and I ran for my camera. I was able to get off one photo before it left again, like it knew what I was going to do. It hasn't been back since. We are leaving tomorrow and I'm not sure I'll be back. I know the Gulf Breeze area used to have reputation for ufo's but has anyone else ever seen anything like this here? Is the Air Force testing anything? I probably won't tell anyone about this because they will certainly think I'm lying. I don't know if its cool or if I should be afraid.