Bill,
Those could be some of the bad side effects, but its quite unusual to be happeneing this quick .I didn't start having the unusaul side effects until 8 weeks into it. Maybe because of his age its happening sooner. I would let your doctor know what is happening and maybe he could perscribe something for it. They now have ADT that takes effect immediately, maybe your dad had a newer, more advanced lupron. Any time your testosterine is eliminated you will have side efeects. They are very similar to menopause that a woman experiences, hot flases, bone loss, muscle loss, loss of stamnia, weight gain around the midsection, loss of cognitive function, nausea, and loss of libido. The fact that your dad is not in good physical shape could be a factor.
Hope this helps
Dan