Welcome to the forum; you'll find a lot of support and information here. It's so normal to feel scared and even angry right now. I am the only person in my family with UC, and I also wondered "why me?" The only answer I ever found to that was "Why not?"
With proper management, there is light at the end of the tunnel. The combination of medications I'm on now has put me into complete remission and I have no bleeding, no diarrhea, and my energy level is back to normal. I eat pretty much what I want, although I still limit the amount of raw fruits and veggies, fatty foods and really spicy foods.
One tip for the colonoscopy prep: they usually have you drink huge amounts of liquid with some type of laxative in it. It usually tastes gruesome. If you ice it down to get it really cold, then drink through a straw, it isn't so bad. Put the straw toward the back of your mouth. That way the liquid bypasses most of your taste buds and it's easier to get down. And stay really close to the bathroom, no one else is allowed to use it during your prep.
Moderate to severe left-sided UC (21 cm) diagnosed 2001.
Asacol, Rowasa, Pentasa, Prednisone, Entocort, Azathioprine
Colazal, Remicade, Nature's Way Primadophilus Reuteri.
In remission since April, 2006. Remicade has been my wonder drug.