@zaa-this is why I tend to ask a few questions with my replies.
Everything is connected. Mind and Body.

TMJ-disorder. I would be curious to know if the ENT you saw, knew you had a long standing history of clenching? TMJ tightness/stress refers pain away from the actual site of the jaw joint. Over time this would cause
referred pain to the face, head, jaw into shoulders. Often times presenting as sinus/nasal pain and or congestion. If this is where you hold your stress, then in stressful times it would show up here. A Neurologist knows and understands pain referrals and headaches, before an ENT.

Many things contribute to inflammation/stress/congestion in the body;

Sleep, Nutrition (Vitamins/Minerals) Digestion, Physical Activity Level, Social Outlets/Community.
All 5 of these play a role in keeping the body feeling optimal.

Positives from your post is that you say you are normally an active person and you do have friends to get out with. I know this might seem hard with fatigue and depression, but even if you could schedule small outings and keep movement going it will help overall. Just small things to do for yourself.

Hope this was helpful.