Hi there - we still are not to the bottom of it although fortunately I am over the worse of the chest pain. I actually ended up going back to the docs as the chest pain became worse. They did begin treating for rheumatic fever and I was given prednisone and a shot of penicillin but as it is rare in adults they made a 'suspected diagnosis' and wanted me to see a Rheum immediately. They also re-ran blood tests. ASO level was still rising however subsequent doctors have told me it is not specific to strep and may suggest another infection which is why it is important to have this looked into further. My second blood tests showed very elevated liver enzymes so I am glad I went back to the first doctor.
I also ended up with a multitude of other symptoms including numb blue numb feet and my hair started falling out, a croup like cough and enlarged lymph nodes and unexplained bruising (to name but a few)! On reflection I have had some of these symptoms for several months apart from the joint and chest pain.
I have now been ill for over 5 weeks which is unheard of for me and the odd thing was how quickly the symptoms would come and go.I also started to take electrolyte drinks and cut down on my fluid intake as I found drinking too much tended to spark a flare - however as my liver was implicated in some way this may have been because of that.
I was referred to a Rheumatologist - who ran panels for auto immune. Despite the steroids - my ASO was still rising although liver enzymes had come down a little. I had an echocadriogram and a multitude of other tests which again were all clear. They have now passed me to an infectious disease specialist to see if there is an infection or if it is indeed an auto-immune which the blood tests aren't showing right now.
I have been told doctors are not very keen to diagnose rheumatic fever in adults so they are now looking at another infection/virus or auto immune. I hear auto immune can be very difficult to diagnose. I am also seeing a dermatologist for some of the skin problems I have been having during this.
I really sympathize with your daughter - it was a very scary time for me and the fact I am still not better makes me realize this may not be something to be ignored. I will let you know if I have any luck with the infectious disease specialist. I do know if it is Rheumatic fever long term course of antibiotics may be required so it really would be worth pursuing this further in your daughters case to rule out other types of infection first. Let me know if you manage to get to the bottom of this and my best wishes to your daughter.