Your friend was probably given remdesivir and put on the ventilator. Anymore a trip to the hospital could be a dangerous thing to do. . . few actually read what they are signing. The stories have been heart wrenching.
PS I take Quercetin as well. You might want to get a bottle of honey flavored Chestal. (inexpensive) It is great stuff. Homeopathic. I swig it at the onset of a cough and routinely after I have had to wear a mask to visit a friend in the nursing home.