You really should have your hand checked again asap. Sometimes an x-ray will not clearly show a hairline fracture, but it can still be there and cause a lot of pain. My Mum fractured her upper arm quite badly two years ago and it was completely missed by the head of orthopaedics, who told her that she had a minor crack in the bone that would heal within 3 weeks. Nearly a year of pain later another consultant looked at the x-rays and told us his boss had missed a major fracture - one that even I could see on the x-ray when given the chance. So, mistakes are made. Please get your hand checked out again asap. Best wishes. :o).