Anxiety problem? Fear of husband dying.?

OK, so this is a little strange. I don't really feel like I have an anxiety problem, there has been once or twice where I felt as if I were having an anxiety attack - sweating, felt like everything was closing in on me, couldn't breath, etc. BUT, that hasn't happened in quite some time. Anyhow, sometimes these really morbid thoughts come into my head, about my husband dying. We're very close, and right now his hours at his job are changing so that we cannot see each other as much as we used to. We do not have a full day to spend together, only a few hours here and there. This has gotten me very upset, but I am trying to overcome it. Just lately, I've been having these visions that he's going to die... nothing specific on how he will die, just that I am at his funeral, etc. What does this mean???