Having ear fullness. Also feels like lymph node behind my earlobe next to jaw is swollen. Ear infection?

Ear fullness. You could have fluid in your middle ear, or an infection. See your doctor for evaluation and treatment.
Ear infection. These could be symptoms of a middle ear infection. This is usually due to a virus such as a cold or flu. If the cold goes away but the ear ache is still there it may have turned into a bacterial ear ingestion which may need antibiotics. However this is uncommon in adults. .