Hi, I'm going to give blood on Tuesday, but I'm wondering if theres something I should say to the nurse about how I've been feeling at work recently. As I am a waitress, I have to be on my feet constantly going about. I am not allowed to sit down for anything. During this time obviously I can't eat, and we only get orange cordial to drink. I find that after about two hours, I feel very heavy, lethargic and most of all, jittery. My hands start shaking, I slurr my words a lot so people can't understand me and I get breathless. It's only when I go get some some food or energy drink that I feel fine again. In the past I have nearly fainted after low blood pressure, you know when everything goes red and you feel sick. My blood pressure has been fine after each time its been checked so they haven't done anything for me. Is this hypoglycaemia, what I experience when I need sugar to feel ok again? I have 2 weeks left in my job but I think I will be taking an energy drink to work everyday until then, otherwise people think I'm drunk!