On a daily basis do something to get in a happy state. Whatever makes you happy do that, if you delay those actions for next day, next week, next year, you may be building a staged frustration, a staged sense of unhappiness, which will start to reflect at some point.
So take charge now, do something to feel happy, and make happiness a habit, something you do on a daily basis, without much effort!!
Next Steps
If you experience tiredness, less clarity, less attention, less focus during the day.
Solutions:
1) Cardio / High energy workouts
2) Sleep more (alone)
3) Take multivitamins/anti-oxidants
4) Go into a meditative state for 10-15 minutes in a day
5) Chill out
6) Break your daily routine, do something different
7) Spend time with friends, and keep your phone away while doing that
8) Travel and relax, and detox (mental/physical)