Menstrual Issues

This is going to sound crazy, but no one understands me and I need answers.
Ever since I was little I've had panic attack-type things where I suddenly feel this horrible sense of dread, like I am going to die or something bad is going to happen. Now these didn't mean anything up until about fourth grade when they became more specified and I would have them at times when I was thinking about puberty, or getting my period. Now this is the worst part: I'm in eighth grade now and I have my period, but I have a lot of problems. For example, the first six months I had absolutely no bleeding, but horrible cramps. Now I have a normal amount of bleeding, but I'll get period after period, with barely a week in between. I also have lower abdominal pain whenever I try using tampons. What is wrong with me? Why did I have this awful sense of dread when thinking about my period when I was younger? Were they just panic attacks that had nothing to do with the problems I'm having now, or is there some sort of phenomenon where someone can predict that they're going to have health problems?