Am I crazy? Or just over stressed?

Over the past couple years, I been developing these "fears" sometimes and they come & go. I can no longer use steak knives or pointed scissors because I'm scared I accidently stab myself. I can't drive on a major highway or over bridges without going almost 10 miles under the speedlimit, getting chest pain, or imagining myself getting in an accident. I'm sometimes scared to be home alone because I'm afraid that someone is going to break-in then murder or me. I'm scared someone will be walking down the street and throw acid on me or I'll pick up food with acid in it. I can't read the newspaper or watch the nightly news because I get really upset whenever I heard about someone being injured or hurt. It's like the mental image of that gets stuck in myself head and I keep thinking it over and over. No one I know personally had been stabbed, murdered, d, or been in an accident on a bridge. What the hell is going on?