In The Last 10-12 Months I Have Begun To Loose

In the last 10-12 months I have begun to loose hair. I am 70 years old and have always had a thick head of hair. I'm wondering if a medication may be causing this. My meds are:
Furosemide 20 mg
Atorvastatin 10 mg ( changed from Lipitor last year0
Trazodone 100mg have taken for years
Carvedilol 6.26 bid Newest medication
Warfarin 5-7.5 mg Have taken for years