I am sorry to hear that you have been dealing with nasal congestion, pressure, nasal obstruction, and that you haven't been able to sleep well. Also that you saw an ENT and they said that the inside of your nose was swollen and that was the cause of your pressure, and you want to know if there is something else that could be causing your symptoms. First off, I am happy to give you some of my thoughts about what might be going on, but ultimately if you want to get a second opinion
I am going to recommend that you see another ENT to get evaluated. I can tell you that from the information that you have given me that it is reasonable to think that the symptoms you are feeling could in fact be from rebound congestion from afrin use if you have been using a lot of afrin. Afrin as you are probably aware is a decongestant that works by vasoconstriction of the mucosa (lining) within the nose. When you use it for too long (greater than 2 weeks) then your body builds up a tolerance to it and when it is stopped, the swelling is actually worse that it was before starting the afrin. The best way to treat this is with steroids, and wean off the afrin while slowly tapering off the steroids to allow your body to compensate. Steroids generally take at least 24-48 hours to kick in (depending on the type), so you should start to notice some benefit around that time. I hope this is helpful, and if you want another opinion, I would get evaluated by another ENT.