Nice procedure. I have used something similar with angelic spirits with varying results. It seems to work better with tree of life angels and not so much with planetary and the like.
That being said I am a little disturbed by the rest of it. No testing what so ever of the identity of the spirit? Since you have worked with him before I understand the ability to detect the correct "flavor" as it were but it is only good form to always be sure. If it can read you enough to know your distaste for grubs I am sure it could read you enough to portray the markers for another spirit you know. Likely he was the correct spirit, but a few extra minutes is worth it to make sure you aren't dealing with an astral piss ant.
Finally, figurative blood?!? You are experienced with the astral, you have to know that symbols have real power there. There are only so many things that blood can symbolize, namely life force.
QUOTE
Shortly afterwards I lost conciousness.
I woke feeling nauseated and weak. This feeling amplified when I gave another
visualized blood sacrifice for the spirit to collect, this time while standing
and visualizing the blood pooling at my feet. Afterwards I laid down in fatigue.
If it wanted blood, give it blood, animal and not your own. You didn't say if it wanted only yours so I assume any blood would do. Your body will replace what you lost but I just hope the spirit hasn't developed a taste for you.
Let us know if you receive your results.