Any advice is appreciated. I'm 4 months postpardum. I have developed a headache that occurs only on the left side of my head (not in temple region). Headaches occured during pregnancy and then went away. Now they have been back for about a month. I feel dizzy. I have problems remembering things. My thought process seems to be off. Now I have had severe nausea for two days. What could this possibily be?