How much Grapefruit-Seed-Extract are you taking? I just started taking olive leaf extract a couple of days ago and I'm liking it. Right after I take it I feel a little extra sensitive and I might get a head ache or body ache, but throughout the day I seem to have more energy. I definitely have a serious Candida issue at the moment so I'm gradually increasing my dose little by little.
Also contemplating taking a supp from my colon hydrotherapist that has Pau D'Arco, oregano oil, Black-Walnut and caprylic acid.
You might consider some of these. Also coconut oil has caprylic acid in it, so you could try that.