My Dermatologist On Sept. 13 Prescribed Doxepin 10 Mg. For

My dermatologist on Sept. 13 prescribed Doxepin 10 mg. for me, to relieve my severe nighttime itching. It worked after a few days! She told me to continue [even though it seems to be not recommended for more than 5 days !And I have been taking it for 16 days. I have an appointment with her [Dr.Sharon Scherl] tomorrow, Oct.1. Whatdo you think she will tell? I have been experiencing FATIGUE for most of the day, but this PRECEDED this medication. HOping for a quick esppoonse --it's bedtime! Rhoda