When you described your condition, I suspected medications were involved.

Medications like SSRI antidepressants do not go well with concussions. If you look at the most severe PCS cases, antidepressants are usually involved.

Dizziness and drowsiness are side effects. Decreased libido is a side effect.

Dry mouth is also a side effect. The lack of saliva in the mouth allows bacteria to grow, and that bactieria can migrate to the brain and cause neuro-inflammation.

Neuro-inflammation is also linked to anxiety and depression, gut microbiome imbalances, and concussion symptoms. That's why people with a history struggle with concussions.

So I don't recommend antidepressants. But stoping them is also difficult because of the withdrawal effects, so you may have to taper the dose.

When did you start taking Omega-3? How is your blood pressure? Omega-3 can lower your blood pressure which would contribute to your tiredness.