Ugh, sounds like a bad fall! My sister fell last year but went into the splits. We are not young and agile women anymore so she ripped her groin muscle. I thought we might need to amputate her leg she was in so much pain. I am just kidding on the amputation but in all seriousness, it was hard seeing her in that pain after a fall. Life can change in an instant, can't it? Okay, back to YOU. So, your fall injured your torso. My son's friend got hurt in a similar fashion playing soccer and it was determined he'd bruised his cartilage. Probably very similar to you. They iced it, he took ibuprofen and had to rest for recovery. It took about 2 weeks.
In looking at slippery rib syndrome, you do seem to have some of the symptoms! https://www.medicalnewstoday.com/articles/320417.php The treatment for it is very similar to that of bruised cartilage of the ribs. Ice it, take ibuprofen, gentle stretching, rest but also see a doctor for diagnosis and a physical therapist for help as well. I've read that it often does get better but ugh, sometimes surgery is required. But I would give it time as you are not even sure if this is the case for you. You could be like our friend and heal very nicely with some rest and time.