I resently had a baby, and before I got pregnant I had this headache in my neck and up the left side of my head. When I wake up it is not as bad, but as the day goes by it worsens. While I was pregnant I didn't have it..but now it is back. Sometimes I have slight tingling in my left arm as well. The headache I feel almost every day. Before I was pregnant they diagnosed me with tension headaches, but could it be something worse?