Have you ever done any mindfulness training? You can look it up on google. It's basically doing exercises to remain "in the moment" and not get too caught up in anxiety about what could happen. It's a big part of dbt training.

When I was first getting used to this illness I was always examining my moods, looking for signs of hypomania. I have learned now through mindfulness that I can be happy and just be happy. It doesn't have to be hypomania or even lead into hypomania. I am still aware of my mood just in case it cranks too high but I enjoy the happy moments a lot more now because I don't worry so much.