Hi,i don't think these are symptoms of mono as its a self limiting viral disease which subsides within 2 weeks or so. Also most probably you would have got rashes once you took antibiotics for seemingly sore throat
but this doesn't rule out its probability totally! as medicine is a science of exceptions and variations have been seen often. The only way is to do test which may again come negative if assuming this is your second infection or superinfection
and not by EBV!
I THINK U SHOULD BE MORE CONCERNED ABOUT THE LESIONS IN YOUR BRAIN WHICH CAN EXPLAIN MOST OF YOUR SYMPTOMS EXCEPT SORE THROAT(ASSUMING YOUR DOCTOR WAS RIGHT). see the neurologist
as soon as possible and forget Mono because its a self limiting disease which is VERY UNLIKELY HERE. best of luck!