Verge of breakdown

I think I am on a verge of a serious nervous breakdown.. so serious that even sitting in front of the computer staring at my wallpaper plus scrrensaver can make me cry.... tears falling down my cheeks... dun ask me why.. becoz I dun even know it myself.. I have no idea why my mood suddenly change from gd to bad within a difference of one day... one day I am happily enjoying myself at Jurong Bird Park and the other day from then on.. bad weather all the way... previous few days I have too much things on my mind.. but I tried not to think abt it... I tried to keep my brains blank... it is now in a state of blankness... yet I am still upset and depressed... I am not thinking abt anything at all.. trust me... seriously I dunno why is wrong with me..... there are things that I need to rethink abt my life but for the moment I am not thinking abt them at all.... noone can help me in this except me myself... I just wish to be alone too.... maybe a few days later things will pass.. I noe thoughts snowball... and nothing seems to go well when U are in a down mood.. exactly what is happening to me.. but I have no strength psysically and mentally to stop it... or maybe I am just too lz...