This is all about control. Feeling of Not getting acknowledge is controlling you from few weeks. To be in control of situation you first would like to have a clear mind. If you choose, start with positive self talk and affirmations. Remember that you were hired because of your own abilities just list all of them. Start some morning walk and breathing exercises. That may help you to regain your positivity. As they say the things that won't kill you make you strong. May be this disappointment can be a platform for enhancing your abilities.

Hello... That means you were normal 15 days back ..lost concentration in 15 days ,you are worried about something .. ..promotion, increment. You have taken it seriously so they are only coming to your mind while working .. Try to get rid of those thoughts .. Or change company if you feel they are doing injustice .. Or take leave and relax for some days ,everything will be fine.