Thank you for the question.
From your description, I understand that you are suffering from a chronic feeling of some blockage in the back of your nose (Nasopharynx
as we call it).
The most common causes for such a feeling are,
1. Nasal cogestion due to a variety of reasons like, an allergy(allergic rhinitis
), Chronic sinusitis
2. Deviated nasal septum
3. Nasal Polyps.
4. Choncha bullosa. (Swelling of the nasal bones and the tissue on them).
5. Rarely, some kind of tumour.
The treatment in each condition is different and can only be advised upon examining you well.
Please do consult an ENT doctor again and get evaluated.
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Thank you and have a wonderful day.