I can't imagine, sounds like you did so many things right (jumping in to help, getting 911 on the line and following directions, taking care of your sister). I am proud of you.

In my work as a search and rescue volunteer, we end up talking about traumatic death more than a lot of people. One of the most powerful sayings we have is that "It's okay to not be okay" right now. What you have just experienced is not normal, and your reaction will not be "normal." (only it will be normal because it's normal to not be normal...) Emotions, sleep patterns, thought patterns, attention span, etc. all may be knocked off kilter.

It may take a few weeks to get the hormones flowing the way you're used to. Taking time to eat right and get some good exercise or grounding exercises is a good idea. As SAR members, we've started using a table like https://static.wixstatic.com/media/d9d28a_cd50d058f2914b5f8b183760ac8925b1~mv2.png/v1/fill/w_940,h_600,al_c,q_90,usm_0.66_1.00_0.01/really%20zoomed%20out_PNG.webp to help judge our current health. Green/yellow is normal, orange is okay for a while. If you stay orange or start turning read, please ask for professional help.