Happiness is your responsibility.No one can snatch it.If you take control over your happiness and focus on the positive activity in your office .The happy people can able to find the path that up their feel good factor.So, build at least one activity which you love to do everyday regularly.
In your office the relationship with your boss or senior is the key to your happiness.so if required take the lead to get the job that you love to do and negotiate with your boss to get more. Try not to get the work you enjoyed least.
Stay always far from all negativity. Negativity always drag you down. Leave the colleagues who always beefing about the boss, whining about the workload. Hook up with more positive people.You know happiness is contagious – hanging out with the happy gang lift your mood.You spend so much time with your colleagues so, invest your valuable time to make good relationship, do good f you can, make bond as well as network with them which give you immense mental and practical support.
Laughter is the best medicine to relieve your tension & stress. Whenever you get time share jokes withe your colleagues which connects you stronger.