Hello welcome in H.C.M. I have gone through your query regarding persistant and recurring sore throat, as you said you are allergic also but unfortunately anti histaminic are not compatable to you. After co-relating all symptoms it is evident that there might be some chronic focus in your upper respiratory tract like sinusitis, tonsillitis etc. So for deciding effective treatment a thorough examination of your nose, sinuses and throat is necessary along with some relevent investigations which will be possible only your direct consultation with your ENT doctor. Regards.