After 6 months of feeling abnormally exhausted, unable to retain information etc, dizziness, nausea, clogged up nose and near vomiting each morning, I now have started on betahistine 24mg (though take half dose as gives tummy pain) for confirmed inner ear infection, levothyroxine 50mcg for confirmed hypothyroid and cortisone nose spray. It's nearly 2weeks and I start to feel more awake but I'm still exhausted and with brain fog. How long does it take to improve? I'm on sick leave from work (primary school teacher) and do not feel up to returning. Any advice most welcome as my dr isn't very supportive and tells me I'm sensitive as its only a small thyroid problem.