Oh Confused, so sorry to hear that, what a crappy thing to happen. It's so unfair.
I know its going to be really hard, but I think you are goign to have to take the lead from your dear friend. If he is being stoical, then so must you. He has just been given the news that he has uncurable cancer (and pancreatic cancer with secondaries in the lungs and liver is as shitty as it gets, as I'm sure you know) and not only does he have to face that awful reality, but he has to manage the reactions and emotions of all his friends.
Have you spoken to him at all since you found out? Is he generally not particularly touchy feely (hence stoicism would be a natural first response?). I think you are right not to ring and weep all over him, probably not a good response, but you do need to be in touch soon to make sure he knows you care (but not in a mawkish way).
It's going to be tough, but I think the best think you can do is prepare yourself to be as supportive as possible for your friend. He's going to soon be living with a whole new reality of chemo and weakness and a series of 'last' things.
This might sound odd, but when you say "I cannnot imagine what it is like for him. Fuck, it's bad enough being me!" I don't think that is self obsessed and, in a strange way, being you is sort of more difficult. I always thought that when my Dad had cancer he had the slightly easier role, he had no choices, no decisions, he just had to take the treatment and fight the illness. My Mum on the otherhand had to support my Dad, keep all the practical stuff going (they were in the middle of a house renovation when he was disgnosed) and deal with all the sympathy, requests for health bulletins from friends etc and her own grief and worries about the prospect of losing her husband. I'm not explaining it very well (and not having had cancer myself, I'm probably not qualifyed to judge) but I think that sometimes it is easier to bear suffering yourself than to watch those you love suffer.
Anyway, I'm rambling now, but just wanted to say I'm really sorry. Sending lots of affection and sympathy your way and please do vent here as much as you need.