I am so similar, I do have Rheumatoid Arthritis RHA Factor, but low, Osteoarthritis and more, my fingers are gnarled and twisted but I’ve never spoke with anyone else who’s been diagnosed with costochondritis, I had one overnight in the hospital not sure if I was having a heart attack or what. The pain was so bad I was massaging my chest for days. $28k ++ later no one can help me. I still get the stabbing pain, frequent aches, if I ever had a heart attack I’d likely think it was another extreme day. I’ve turned into one of those people that always had an ache or pain to complain about and I do not like that at all! It’s not who I want to be.