A friend of ours did the same a few years back. His wife said goodbye and popped to the shops and came back to him hanging in the loft.
No note, no signs of depression or money worries.
I really feel for you buddy. Try to be around friends as much as possible and just remember that someone who is really determined to kill themselves will eventually, and there really is nothing that you could have done than you already did.
Like others have said on here, make sure you keep posting if you feel you get comfort and support from the STW crowd.
All the best