Missing pieces

It's been a week that the feeling conquer me badly. I couldn't tell how hard is it and cant even express all in words. 

please tell me, how to make everything goes right? I really feel like crying.

Since the day I back from Singapore, nothing seems to be alright with me. I feel like something is lost or missing. The empty space seems unable to be fill up. A lot of questions are running in my mind which dont hv the answer for it.