welcome to healthcaremagic forum,
Mucosal thickening in left sinus and retention cyst
sometimes could be an incidental finding in MRI. If it is associated with symptoms of sinusitis
like nasal discharge or sinus headache
, than it must be treated. But Dear we treat patients not MRI reports.
As you mentioned there are flow related changes in the internal carotid arteries could be vague signs in MRI report.
As you have not mentioned your age or symptoms so it is difficult to correlate clinically . Mood swing
is not related anywhere to it. You can see a Neuropsychiatrist or an Endocrinologist
for help. Thanking you