Had a operation on my hand carpal tunnel surgery had problems ever since op i am self employed so i went on the sick trying to claim Esa got turned down as not paid enough NI as i didn't know when your child turns 12 they stop paying you credits just wondering is it worth my while paying it on my self assessment i dont earn enough to pay NI but will pay if i can claim ESA as dont know how long i am going to be on the sick for thanks