I feel for you because I understand how killing heartbreaks are. But, please, do not take a negative decision to end your life when you are feeling low. Get help. Reach out to your family, your friends from school, college. Anyone, whom you can speak your heart out with. Even your room mate would do. It will make you feel a lot better. Take a vacation. Go to places you wanted to go before. Look at the positive side of your life. A wonderful life you have in comparison with those millions who have nothing to eat and no future.
Strictly, stop being alone. Stop being in the company of those who make you feel sad. And stop your negative thoughts as many times as they come back.
No need to about talk this at work. Often, people aren't 100% productive at work, and everyone adjusts. Co-workers/employers seldom complain.
Connect with others as much as possible. If you have no one to talk to, you can contact me. I will be happy to be help.