Throat itnchness daily since 1y. Helped!

Im getting throat itnchness daily since 1y saliva looks not much enough producing in mouth i have took anti cold tablets few months ago when i got cold, i repeated those tablets whenever about to get cold,that's the reason my cold never come fully since 1y is it's also the reason, also I have took lot of medicine since 2y because of leg pain I have,like neurology,pain killers also took stamina boost tablets,zinc, muscle building tablet, testosterone boost tablets most important is i have got back pain 2y ago, doctor was said that it's because of dehydration of body so is it causing my throat dehydration also I feel if i don't sneeze in the morning,I get head ache with throat itnchness if i sneeze in morning I don't get this symptoms i have took otrivin ,nasal spray ,acid reflux but not helped