Time travel sounds like something that would cause more anxiety, or at least it would for me XD Because you fret about something you did before, maybe if you did xyz differently things would turn out better, so you go and do that, but maybe stuff ends up being worse because even though the situation you went back in time to fix up for yourself ends up better for you maybe something else turns out much worse, or you accidentally really upset something for someone else that you care about. Alternately if you pop forward to see what would happen if you did uvw, then you start stressing about which possibility would be the best one XD

I don't think thinking about the past or future is a bad thing really, obsessing might not be so good though. Popping a xanax (or whatever stress-relief of choice, it's usually art for me) sounds like a much better and easier option ;D