Lonely and Sad

Today I am feeling so lonely and sad. Everything in life seems to be perfect but still some unknown , undisclosed ,masked feeling is holding me from enjoying my current state. It was so merry and rosy when i was greeted with Good Bye card. But a slight thought of good old days brought restless feelings to my heart.
Some times its difficult to know what your soul longs for . It is just emotions which longs last.
Why do we get attached to some one, some place, some people, some habits.. Why ???
Why is moving on in life so difficult . Why cant things be permanant ? Why cant we live with same set of people whom we like ? why change is required ??
I guess no one asked this question to god when he decided that time moves on and accordingly people too. I wish I could have got the answer of same from Almighty so that moving away from my project, people whom i love, friends in bangalore, my collugues wouldnt have been so difficult.
God please help me overcome these rush of emotions and calm my wandering mind ..
My last day in RPA, UK , Banagalore.. :(
We think holding on makes us strong but sometimes it is letting go !!!