Struggling with postnasal phlegm drank anti hestimies and acc and nothing seems to help do i need to go see a ent?

Postnasal: You could try irrigation of your nasal passages with clean warm salt water or buy a saline nasal spray. An ENT specialist could determine whether you have a sinus infection which requires oral antibiotics or may prescribe a trial of corticosteroid nasal spray and whether to continue antihistamine medication.

Yes: These type symptoms can be a bacterial sinus infection and an ENT specialist can treat it or often a primary care doctor will treat it