You have received excellent and helpful advice from Susie197702! It very well could be fluid behind ear which is common after this type of infection. I'll just add that otitis media is another word for ear infection. Sometimes ear infections do not recover from the first line of antibiotics so if you still feel pain, please call your physician back. However, take the full course of medication before determining that it hasn't worked.
Another possibility is also labrinthitis. This can also cause symptoms such as you describe. https://www.medicinenet.com/labyrinthitis_inner_ear_inflammation/article.htm This would be something to consider along with Susie's awesome advice.
Did your ENT say anything about fluid behind ear drums?