More information on my experiences with Valerian Root and Melatonin. I started taking it every night about six weeks ago because sleep is such a trigger for me and took it daily. I have also had a low grade headache for a month. about a week ago I stopped taking both, along with Calcium / Magnesium, and a Multi Vitamin and during the last few days have seen the low grade headache go, though I had a migraine yesterday.
I did some research and found studies that showed both Valerian Root and Melatonin can cause migraines and also found studies that showed melatonin can help migraine sufferers. I found research that suggested that 3 mg is sufficient though the bottle I have says 3 to 9 mg is the prescribed dose. I had a migraine earlier in the week and took 2 valerian root with my medication and it helped tremendously.
So my advice is keep track of how you're feeling and note any changes. Even though my doctor okayed both of these and they didn't trigger migraines I think one or both may have triggered a low grade headache (similar to a rebound). It may also have been the fact I was taking them daily as well rather than occassionally.
I have stopped all of my supplements right now and will be test any future ones one at a time to see if it causes any side effects instead of starting two or more at a time.