Is it normal to feel obsessed with thoughts that are unfamiliar to me?

At the moment I can't stop thinking about what's going on with me, but I'm just very stressed, nervous and haven't been able to sleep for a few days, but I don't seem to really need it either. I never felt the urge to search for anything. It never bothered me at all.
But still I have to keep looking for symptoms that I don't really care about. Can my cannabis use be the reason for this?