Depression causes us to really look at the negative parts of our lives. I had those fears like forever and told myself and therapist that I would be dead once they were all gone if I survived. Fast forward and everyone is gone (mom, dad, animal friends) and I am still here. The best advise I can give is to just remember the good times with Sunny and that you are doing what's right (Sunny is too important to let suffer). With everyone else in your life, try to enjoy each and everyday with them. I had to make the dicision to pull the plug on both my parents (only child) and I just remembered how much I loved them and the last thing I wanted them to do was suffer. I did a lot of crying but told myself that I needed to continue making them proud and be the person they raised. I have 2 really close friends and they have gone through it all with me and still do. Good luck as I know you will be strong.