Confusion

So, I talked to my grandmother yesterday...it turns out that my grandfather has cancer. I am really confused and very irritated with the medical profession right now. I know that doctors are not magical creatures that can fix everything, but I do count on them to make me feel better. I understand that you live life, hopefully its a long life, but that at some point it comes to an end, and no doctor can make you live forever. I guess I have always thought that doctors were there to tell you what is wrong with you and then treat it (if treatable).
My grandfather went into the hospital on Friday, April 17. On Monday, he had a surgery on his cheek...they went in and cut off the nerves in his cheek because of the excrutiating pain he was in. On Tuesday, they put in a feeding tube due to the fact that he hasn't been able to eat. He had lost 7 pounds in a week. You should know that my grandfather is about 6' 2" and probably weighs 110 pounds, so to lose any weight is devastating. On Wednesday, he had another surgery on his cheek because they were unable to cut all the nerves that were hurting him. Finally, on thursday he was able to rest. On Friday, they gave him 3 units of blood. Yesterday he had a C/T scan where they found a mass on his liver. After taking a biopsy they determined that they were cancerous cells.
This is where my confusion starts. I was thinking that meant he had liver cancer...which he does, however they said that these cancer cells had spread from somewhere else....but they dont know where. Hmmmmm...What do you mean you don't know where? If the only cancer you found on the C/T scan was on the liver, it stands to reason that is where the cancer is....but I am not a doctor, and the doctors wont explain this to me, because they can't determine the source of the cancer at this time. Today, he is having a colonoscopy...this will help rule out colon cancer, but also they are trying determine why my grandfather keeps needing units of blood. They cant determine where he is losing blood from.
Basically, they cant tel where the cancer is, or where he is losing blood. Hmmmm...Confused? I am. Blood isn't just evaporating...it has to be going somewhere. Why cant they figure this out? Also, I dont know if any of you have known elderly people, but in my experience, once something goes wrong, followed by a long list of other things it usually doesn't last for long. I, sadly, have come to the conclusion that my grandfather isn't going to be living much longer. I wish I had more faith, but the very fact that the doctors cant seem to find their head from their ass is very discouraging.
My uncle is getting married on Saturday, and I dont know if my grandmother will go...obviously someone will have to take her. The woman that my uncle is marrying...her mother passed away a couple of weeks ago. I have a feeling it is going to be a very sad, emotional wedding.
As far as my family goes, my grandmother is the person that I am closest to. I spent every summer with them growing up. Even though we didn't do fun, exciting things, I always felt like it was the best time of my life. I usually had to share a couple of weeks...usually one with my sisters, who always went home after a week, and then once I got to highschool I finally had some cousins that I shared a week with, but for the other 2 months...they were all mine. For a whole summer, I got to be away from my family, away from my mom...I loved it! My grandmother and I would go on walks, and about 2-3 nights a week we played Liverpool Rummy...my favorite card game. I am very sad. I can't help but think about everything my grandparents have done for me. I can not possibly begin to repay them. I dont kow what my grandmother will do on her own.
They are very old fashioned...my grandmother cooks and cleans, my grandfather takes care of the bills. If they need to go grocery shopping, he drives her to the grocery store (which they still call "the market"). They still buy all their meat directly from the butcher...even ground beef!
The reason I think about this is because if we purchase our home...we want to be out of here in 2 years...in a bigger home, in a good school district. Basically we want to go further north...if my grandfather isn't here at that time, I dont know how I can move further away from my grandmother. I am just incredibly sad and worried.