Anonymous,

Have you been taking any nutritional support with the sauna. I know it can deplete magnesium and minerals. When I tried the sauna's I had muscle tightness afterwards because I was not supplementing. Sherry Roger's book "Detoxify or Die" describes a sauna detox program which includes nutrients to take before you go into the sauna and sauna replenishing nutrients afterwards. I think there is a group on Yahoo that discusses sauna detox also - maybe you want to check it out if you haven't already.

Hope this helps.