Hello, I'm 14 and my head hurts when I lay it down while I sleep, for example, the back of my head and what type of pressure pain?

Hello, I am currently suffering from circulatory problems in my legs and hands and have a doctor's appointment soon. I have been adjusting my diet and exercise for some time now. However, as a student, I can't move around all day because I have lectures, have to study, write homework, etc. Which position is best…