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sqad, had sinus infection before, in fact more than once, and am under the care of the ENT hospital for tinnitus, vertigo. And yes i do know how it seems to some doctors when they can't get to the bottom of the problem, just as i feel frustrated with presenting myself as some sort of weakling. I have been offered anti depressants, and whilst i can say i am depressed now, it's because of a protracted illness, it didn't start out that way.
It's quite possibly a sinus infection brought on by a viral illness, so will see if can get hold of the ENT consultant i normally see.
I wish you well by the way for your recovery, am glad you are home.