Struggling

I’m 22F and I was diagnosed with Stage 2A Hodgkin’s lymphoma. Today is my first chemo and I feel really anxious. I have spent most of my teen years in the hospital and I thought I was finally over all of that. My brother was diagnosed with stage 4 HL 3 years ago as well. We have dealt with too much as a family . I was studying abroad and had to put that on pause and come back home for the treatment. Its very overwhelming. When do you start losing your hair? How much weight do you gain? How is it for you mentally ? I have so many questions. Any advise will be appreciated! :)