Chronic Post nosal drip Complication

hello , I have had post nasal drip for a couple years now it started since I was around 14 or 13 I think back in 2018 around the time of the Covid -19 outbreak. I'm now 17,And I don't know how I developed it or why I developed it it just somehow happened to me. And I have seen my doctor about it, I've tried nasal sprays ,saline solutions as recommended but they only provide a temporary solution. They don't really help as much I notice the symptoms will ease up for while but come back after a while. I even drink plenty of water and warm fluids to thin out the mucus. But It seems like it never goes away no matter what I do. My doctor told me what I think the cause is and honestly I don't know and I'm still trying to figure out what's causing this and don't think it's allergies but it could be. But I do notice my post nasal drip gets worst during cold seasons, so that's when I usually use nasal sprays the most. I think it even causes my brain to feel a little fuzzy sometimes, and can give me headaches .Sometimes I'll try to spit the mucus out to keep it from congesting my throat but it causes a metallic taste and unpleasant odor in my mouth . So I sometimes swallow it to avoid that, and frankly im just so sick of it .I think I might have some kind of sinus or bacterial infection I don't know what's wrong with my nose. I want to consult with my doctor about other treatment options but my mom thinks I'm overreacting and that it'll go away on it's own. But it hasn't, it's been years since I have had this problem and I desperately want it to go away .Right now seeing a doctor isn't really an option because my mom doesn't think it's that bad and refuses to schedule an appointment for me. I don't know what to do I'm thinking about going back to using nasal irrigation once a day because I only used it once the first time I tried it. Didn't see much of a difference so this time I'll try using it once a day and also consider getting a humidifier. But apart from that I really think I need some serious medical treatments because this has been plaguing me for way too long and right now my head feels uneasy from swallowing this mucus And please if you also suffer from Chronic Post nasal drip ,and have may have a clue as to what's causing it and what treatments or remedies you use that might work for me please let me know ,I would really appreciate it.