Suggest Treatment For Pain And Numbness In Thumb Caused After An Injury

I was involved in a car accident hurt my back whiplash ! Wen the other car hit in to me my hand hit the dash board first they crated it and said some fracture to the thumb they plastered the whole arm 3 days later went back to see the doctor at the orthopaedics he said their wer no fracture in the thumb he injected my thumb with hydrocortisone injection now I m having severe pains in my thumb the whole arm this was in December last year I can t write because theirs numberness in my thumb