Can combining Doxepin and Flunarizinum cause excessive drowsiness?

I'm 69 years old. I suffer from migraine (one day, every 10.14 days). The psychiatrist to whom I was referred lek.allergist , she referred me to Doxepin 10mg once a day in the evening, because I also suffer from insomnia and sometimes have anxiety. Yesterday, while on a visit to my GP, I got Flunarizinum WZF 5mg. Both drugs I have to take in the evening. My questions: - will both drugs not cause too much drowsiness - if not what time interval to keep when taking them.