Hi vic
I am sorry to hear the problems that you are having and your Dad is not well, just wanted to say that we had similar problem with my Mum last year, all bloods ok etc, no infection found, but was hallucinating,she also went unresponsive, was so frightening, they did start her on broad spectrum antibiotics, and then later found that she had a chest infection, Mums bloods never seem to be affected when she gets an infection!!! Good luck and I hope they find out what is wrong with your Dad soon.
with much love michelle x x