Really tired and night sweats

Today is day 5 on Lexapro.  Praying that this tired feeling wears off.  I did not take a Xanax yesterday.  Very tired yesterday.  Last night was a little scary.  I woke up around 3:30pm and around 4pm I started having hot flashes and night sweats.  And i was dizzy and light headed and like my brain was foggy.  That lasted about an hour and I couldn't fall back asleep.  Maybe menopause is finally kicking in?  don't recall hot flashes as a side affect of Lexapro?  Had another hot flash this morning after I woke up.  I am so dead on my feet tired today and I have an appointment this afternoon at 1pm.  Water loss.  Hopefully not too bad.