Throat issue. Effects like vit d or b12?

I am feeling itchiness in throat and there is dryness also with scratching like feeling. When i swallowed food in morning it felt as if food is passing by scratching the throat. I have allergy since many weeks in nose(redness inside nose) so i thought may be allergy is responsible so i took benadryl lozenges. I felt better again but mouth was becoming dry so i drank 1l water after which i felt a bit good. But it is not totally resolved till now. I am having gutright l in morning goldrabi d in evening and also methygold d and d gain cap and naso b12 spray alongwith limcee and keraglo men. So is there anything to worry about that throat? And can these medicines cause such side effects like vit d or b12? Actually the dr didn't did tests for vit levels and prescribed it because i left milk since 6 months of age and lactose intolerant so no milk products since then. And yes i was doing betadine gargle 5ml at night since 3 days for protection but the condition started today.