I tried vitex for about 4 months (I know you're supposed to give it at least 3-6 months) but stopped after I sensed my libido had gotten even worse. Whilst on it, I also developed the most awful bout of hormonal Acne I've had for years and I'm still trying to clear it. It could've been a coincidence but I find myself going with gut instinct and at the time, my body told me to quit. Didn't have any side effects from it though, which was a bonus!
My acupuncturist monitored my temp for a while and said she suspected the mirena has made me hyperthyroid - if this is the case, it mihjt just explain my awful brain fog too! I am trying Nutri West's Core Thyro formula which has a bunch of herbs in it as well as vits and minerals. I also take Oil of Evening Primrose and Zinc during the day and Co-enzyme Q10 and a calcium/magnesium mix after tea. I do feel better than I have in a while, so perhaps it's doing something!
Sweetpea