Yeah it does sound like it was from lack of food. The same exact thing happened to me today at noonish after I hadn't eaten anything since last night. I hate it....
One time after riding my bike on the campus i smoked a joint and my pressure got so high i colapsed on the grass and stood the with all the veins in my body poping out and my hand veins where becoming kind black then after one houer i got up and went away but i remenber a GOOD samaritan who stood close to me looked down and said "HOLY SHIT" looked up and went away and thats cos i was asking for help people so kind