Hi sam
You do sound very low and stressed.
I strongly reccomend that you speak to The Samaritans. You can phone or e-mail them, and they will listen to you without being judgemental, and offer you some of the motional suport you are obviously lacking at the moment.
I am sure you can see that the way you feel right now is purely the result of a certain set of circumstances which have conspired to bring you down by arriving all at once.
With regard to your friend, i would try contacting him once more when he returns, and if he doesn;t get back to you, it is not meant to be.
That said, if he does, don;t throw all your emotions into a new reelationship at this stage, you are vulnerable, and could be hurt again - something you don''t need.
In the mean time, there are loads of empathetic people on here, so post away, we are here to listem and help if we can.
Hope this makes you feel a little less isolated.
A x