the choice is yours

They say that in a healthy brain, for the first 90 seconds of an emotional reaction to an event or situation, you are a victim of your own hormonal and chemical surges. You react without thinking; your brain sends signals, your heart rate increases, blood vessels do their thing, chemicals bathe your neurological pathways in goop that produces anger, happiness, shock, fear, whatev.

But that is only for a minute and a half. After that the flood subsides, and it's your choice how you feel. If you are harboring feelings you don't like, like jealousy, regret, etc., it really is a choice of yours.

Similarly, you can create your own happiness. Something might happen to make you feel good, but after 90 seconds, it's no longer "making" you feel good; you choose to feel good. And I like this feeling; I consider lying in bed and thinking about the one you love to be a wonderful, hedonistic, organic self-medication.