What to do?

There are any number of options, but pick things that occupy your mind as fully as possible and are relaxing/soothing. Some really basic advice:

Reading -- This is a tranquil activity but can fully occupy your attention.
Meditation (or praying if you're inclined) -- A good way to empty your mind of distractions.
Physical activity -- Strenuous activity is particularly good, like running, cycling. I particularly like swimming.

Good luck

 

"go to solution for sadness, happiness, boredom etc"

Means you need to work on your inner self. You can only cover it up with staying busy and hobbies for so long.

 

My city has a social sports league. Volleyball, soccer, spike ball, a few others. Just pick. Anything that gets you around other people. Social isolation is the proximate cause of mental disorder.

 

Personally I found a therapist that had experience with sex addiction and took it f'n seriously. Originally went every week, now every other week, soon to be every 3 weeks. I went to SAA meetings once a week and still do. I read a lot of books as well.