Benadryl dosage too high?

I take kava kava (600mgkavalactones) and (10-20mg) a day. Recently I have been taking benadryl (50mg) and melatonin (4mg orally) to help me sleep at night. I've noticed that benadryl helps me with my anxiety as well and I've also been taking 10-25mg during the day. I've noticed that i'm starting to get headaches and sometimes very tired. Is my dose too high? any opinions?