For nettles tea, you can let it steep for as long as you like. I put the herbs in a pot and simmer them for about 15 minutes, as the stronger it is, the better it works. The tea tastes good and is mild--I have never experienced any side-effects. It's kindof like parsley.
Another helpful thing could be to bathe with Epsom Salts . This is really helpful for detox and I've found is one of the few things to help 'anal itching' I've experienced from parasites.