Hepatitis C
"Next Monday 5/22 makes 4 weeks on Harvoni.  The first 4 days I felt zero side effects.  However day 5,6,7 no sleep and on day 7 the worst headache in my life lasted all day.  Since then the side effects have started to diminish.  This morning I do not have a headache and finally started sleeping again.  I am up to 8 hours."