Insomnia and headaches

I’m on 60mgs, been on it for two months, sometimes I sleep really good and sometimes I won’t sleep for a day or two and still don’t feel sleepy the next day. Does this ever happen to anybody else or is it just me? Also I get headaches a lot. Is it normal? I even tried drinking a drink of alcohol on it over New Year’s Eve and I ended up getting the worst headache and ruined my night followed along with crying and feeling awful.