Constant phlegm in throat, very itchy or burn throat, violent cough to clear phlegm and breath out deeply to clear phlegm. 2 weeks of these symptoms. ?

Drink more fluids: There are other questions that need to be answered. Why speech deficit and vision loss? If this was due to a stroke or other problem, The simple answer is to drink more liquids, especially tepid water and take Mucinex (guaifenesin) DM and an antihistamine to help liquify the mucous and decrease the itch. If it continues you should see an otolaryngologist to determine if there is a diverticulum