I had the same problem when I first started shooting a bow. Stupid me pushed my self to shoot while it hurt ended me up with a trip to the doctor and not being able to shoot for two weeks. My advice would be assuming it is a 60-70 bow back it up to 60 and only shoot a few times a day and then start building up to shooting more and more. Only after shooting on 60lb for a while do you want to start building back up.