Hi thanks for your question.
has nothing do with your vaginal wetness Antihistiminics and decongestant have will not decrease your vaginal screations.
There is no harm in getting yourself examined by a gynaecologist to rule out any infection (although you claim none).Vaginal lubrication
is important for sexual pleause ,but excessive lubrication is mostly due to yeast infection of vagina.
Hope this answers your question.