Hello, my name is Misty. I know that dehydration can cause all kinds of side affects in your body. For two days now I have had a headache. It is not constant. I only notice it when I bend over and sometimes it does not hurt at all when I bend over. The pain has lessened since this morning. I also have heard or kind of felt popping in my nose by my sinuses almost like when you are congested and then blow your nose and the mucus moves. Also the pain in my head was all over this morning but as it has went away it only seems to be on the right side now. I don t know if it s dehydration (because I have been drinking water) something with my sinuses, allergies or something completely different. Please advise.