How about magnesium?
There's a product called by Natural Vitality Natural Calm, Raspberry Lemon flavor. You can start with 1 scoop of magnesium in 6 oz. of hot water ( not boiling hot) , once it fizzes, drink it down right away, and it should help within a few hours, if not, then you can safely take another dosage.
Let me know how it works for you.