Running with arthritis

[imruner]

I'm 28 and unfortunately inherited my dad's arthritis at 19. I've got it in both knees and in both SI (Sacro Illic) joints. This makes running difficult at times and very discouraging. I'm just looking for tips, encouragement, anything, to get me off the couch. All I think about is how much I will hurt during and after if I go running so most times I don't even go. Any ideas???
Thanks!