I'm a teenager and all the loss I have had lately is hitting me hard?

So my grandmother was a healthy women she did not drink or eat bad. She was 84 years old, and we live in Michigan United States which gets really cold during the winter, my grandmother drove to Flordia and stayed there most of the Winter, and when she came back. She had her checkup she was in stage for of liekuiema ( cancer) and the doctors gave her 4 weeks to live, and my uncles and dad did not tell her about it, because they did not want my grandmother to be depressed and know that she was going to die. One day we we're over her house and she was getting worse, she barely talked, and did not eat. She could not move that good, and when my parents and I went home a few hours later we got a call saying that my grandmother was taking to the hospital, and of course my parents , me , aunts and uncles all went up there. When we got up there the doctors told us that she would not be coming home, and was suffering, and gave us the option to pull the plug on her, because she was doing terrible. My family decided to pull the plug and let her go, because we hated to see her suffer. About 15 hours after being at the hospital we all gathered in the room I was at the end of the bed, the doctors took her breathing machines off, and we we're all in there. My whole family was crying the people that I saw as the most strongest people In my family just started to cry. I knew they cry because they are humans, but it was weird to see. When my uncle tried talking to my grandmother her stats when back up like she was trying to hold on, and its weird going over my grandmothers house that other family lives in now. Not seeing her in her chair or here her talking about how proud she was of me. I miss her so much it seems unreal.

Next, back in July

I went to the store with my parents and the night before I was sleeping with my dog she was right next to me and she was okay. The next day I went shopping with my parents, and I cam home and she was getting sick , and would not move. My mom took her in the bathroom and laid her on a blanket, and i went in there to check on her, because I did not think it was that severe at first, and then I started crying I fell on the floor. This dog has been with me since I was 8 , I got her in 08. Then my moms dog which was about 14 years old died a few days after and he cried so bad, and he died during the night. I miss them so much I hear the words " Shes dead" replaying in my head when someone went into to check on my dog. All this loss is overwhelming me, I feel guilty. Guilty that I should of talked to my grandmother more, or taken better care of my dogs. I watched my grandmother take her last breath.