I have been on creatine for about 2 weeks. Friday I got in some CEE that I ordered. I was originally on Creatine Monohydrate. I took one serving Friday, worked out and went home. I did some heavy shrugs. Went out to eat and drank some beer(4-5) and when I got home I had terrible headaches all of a sudden. Saturday was the same and today I am still experiencing them. I also have a really sore neck from the shrugs. What is causing my headaches? Beer, Neck soreness, Creatine ethyl ester?