does your body temperature drop?  I find before I meet a lady I get the chills and get very cold, to the point I am shivering, even during hot days in the summer this happens to me.  Is this some sort of nervous reaction?  Does this happen to anyone else?  once the session starts, it seems to go away, but 15 minutes before the session I get super cold.  odd, isn't it?  also, i am typically a type of person who is always hot... i keep the heat low in the house in the winter and am easily warmed up during exercise or physical work.  i don't know why i get the opposite for an appointment with a lady... weird.

heart is beating fast in anticipation.

Maybe you ought to check that out with a doctor.

after I'm done, I could cool a room, just with the temperature of my feet!  Apparently it takes a bit for the blood to return to the other parts...

Check with the Love Goddess on the The Erotic Highway. She is all knowing and all wise.

You are nervous/ excited and your body is burning up a lot of energy. Hence chills could be from that. Eat. Have a sugar snack. See if it makes you feel better. If not, a doctor!