I’m a mess help please

I really just need to talk to anyone who has anything to say. I’m a sophomore in high school and I’m on the junior varsity girls soccer team. So at our game last week I was rushed to the ER for extreme dehydration after taking in a liter and a half of IV fluids. At the ER they took a whole bunch of heart test to make sure I was okay when all the results came back worryingly I was rushed to the hospital by ambulance where they found out I have a hormone issue where my brain likes to control the blood in my body and it can work my heart to death. I still wont know if I have an issue where my heart just can’t work properly until Friday. But today was the first day I was allowed to play In a game for soccer. I told my best friend who also is on the team that I didn’t feel good today, that I was having the same symptoms as before but exactly like the day I was rushed to the ER she seemed to not care she didn’t give me so much as a glance. Normally she would’ve worried so much but idk why she’s acting so differently and it’s making me very stressed. But anyways I walked on the field and as soon as the whistle blew I ran and went for the ball a girls cleat and foot dug into the side of my knee causing me to fall in pain after realizing I could not get up, the coach carried me off the field. I just feel very stressed with all of this school and other things. I’m sorry for how long this is but honestly it’s not getting better. Plus today is the birthday of my best friend Sara who died of cancer a year ago. I just feel absolutely hopeless and I just want to disappear from the world. School and medical bills aren’t helping either. Please just help me by encouraging me since it seems no one else cares.

UPDATE:

Sorry I haven’t kept up with this in a really long time. But I am totally better my heart is ok I just have to stay away from certain medication and no caffeine ever. Also I’m better with my friends I ended up talking to them about it and they were understanding and there for me through everything. Also I am preparing myself for soccer by going to therapy for the knee and also just running on the treadmill preparing for a tiny 5k. The bills are being handled and my family is just working one day at a time. This was definitely a hard time for me and I’m so happy I got through it and am just staying strong. Just thank you for everything you guys are commenting your positivity has made me feel so loved and touched, thank you so much.

ALSO to anyone going through a hard time everything gets better. Sometimes the biggest storms have the biggest rainbows. 🌈 and your way stronger than you may know.