what ur problem is a common one called as a mountain sickness
or altitud sickness..
as there is pressure changes in the environment when we travel from higher to lower altitudes and there is decreased oxygen
tension in the climate when we go higher altitude of 2000mtrs and above.. we get the problem of eustachian tube block in the ear which leads to sore throat
commonly..in order to avoid this we need to take more breathing at higher altitudes.
ther is a way to avoid this by taking diamox tablets prior to going higher altitudes or we need to atleast take chewing gums and keep chewing them inorder to keep the eustachian tube open..
so dont worry and take the precautions .. have good health ..