How bad is this going to get?

I feel like I have a lot of markers for this. I am going to med express tomorrow. how bad is this going to get for me? will they keep me in the hospital, and if so for how long? will it have to be by an ambulance? am I going to make it to high school graduation? I can't sleep and I'm so afraid. i have severe medical anxiety and my family are interesting people that I know aren't going to make this better. I'm in a happy place in life, I'm almost graduated, I have good friends and a boyfriend...I really don't wanna die:( will I be okay for the hours I have to wait to go to med express tomorrow???

edit: med express is urgent care. sorry I forgot not all of them are called that!

Update: went to doctor for x rays and they listened to my breathing, they seem to think it's a pulled muscle, hopefully that's right!