Sorry to hear that bro, Keep your head up and think of the good times. Most important part is to realize the pain and suffering is now over.
My grandma died last fall after a 10 year bout with breast cancer, I'm glad she isn't in the pain she was in. She was tremendously strong and did whatever she had to do to live. Whatever treatment her doctor would offer her she took it no matter how much hair she'd lose nor how sick it made her feel. The last 2 years of her life she couldn't even sleep in her own bed nor could my grandpa who laid next to her on the floor as she was laying in the lazyboy. Keep your head up and think of the good times you had and the good times you WILL have in the future. But never forget them either as they are who made you who you are!
Hope you feel better, thoughts and prayers to you, your family and friends.