I Have Insomnia And Was Prescribed Ambien. I Cannot Deal

I have insomnia and was prescribed ambien. I cannot deal with the side effects I get the next day and it stopped working for me because I would wake up after 2 or 3 hours with anxiety. I was prescribed xanax for a PRN. Took for the first time last night 1mg. It worked to put me to sleep but I have felt anxiety on and headache all day today. Should I take a lower dose tonight or just stop taking it?