question: Hi, My 21 yr old daughter is tired all the time. we have seen a gnrl phy; blood work and chest xray, Asthma Doctor exam. Blood only showed a very little low blood -sugar(rx= B12), Asthma = The known alergy and  (rx =  singulair, and watch closely for when symtom happen, 1 month. this Dr referenced EIB even though the tired all the time is not exercised enduced. Could there be another direction we could look?