Hi, I am Dr. Atul Kumar Nimawat, MS ENT.
Based on your symptoms — facial swelling (initially), throat pain, persistent sinus pressure with headache, pain radiating from under the ear to throat, along with mild fever — this is suggestive of an acute sinus infection (sinusitis), possibly of bacterial origin, especially since common medications and steaming are not giving sustained relief.
Next Steps
Since your symptoms are persisting despite over-the-counter medications, I strongly recommend visiting an nearest ENT specialist for examination and to start targeted treatment.