Yes, I've experienced this as well. I have issues with my hair coming out by the handfuls too at times. I noticed just by happenstance that when I took B complex vitamins it would decrease and when I would not take them for a few weeks it would start up again. I'm not positive this is the source of the problem as I have been excessively tired lately, I've started taking iron pills in hopes of elevating that. I was actually put on thyroid medication a few years back but when I changed doctors they did testing and said my thyroid was normal. You should probably go see your MD and get some blood tests done if this continues. I keep promising myself to make an appointment but just never get around to it...