hello, yes there was a lot of internal heat, which i have anyways, but not unpleasant. the book i have is from this fellow http://www.easternhealingcenter.com/En/pi_gu_healing.htm
he suggests or stipulates its best to have his treatment, which is no doubt true, but if you have a bit of experience in other qi gong practices I think you can adapt to these quite easily. there is also an article from a friend of mine he has been doing, scholarly, on bigu which I will post or link to when he sends it to me. the problems with your temperatures may well indicate that its not coming on naturally. i find it best to ease into it for a period of weeks even, semi fasting, doing the specific practices of pi gu really stave off the cravings of food and then all of a sudden the state sort of just happens, not really ever quite tired even after strenuous effort or work. its sort of hard to do in a social setting as my internal clock was so off and i had to stay up for two and three days straight with the energy and then sleep a bit and back up. kind of hard to assimilate in that past situation. as I am now in a more secluded hermitage, with little distractions or responsibilities, its back on now. many of the texts i have read describe that the earliest bigu was less radical and differentiated than later times, where it came to be designated as full and half bigu so to speak. i guess i spend most of the time of the year in half bigu anyways, only eating out some remnant of social rituals with a friend every now again. one thing i noticed that after weeks i would get a pressure in my third eye that was only relieved after some meditations i was taught just for this purpose. again, will post my scholar friends piece and hope that link helps. I do believe Penn State or something had a conference last year or so on this, my scholar associate is in contact with the clinical data people there and getting some positive results.