Guys, I need help. It has been 8 weeks since I am on testosterone propionate, and I am having some terrible headaches all along. I am taking 200 mgs EOD. My AI is arimidex, I take 0.25 mgs every third day, and started taking it from week 6 only, so I am sure it is not arimidex that's causing my headaches. At first I thought that I was just training very hard and got dehydrated, but I drink a lot of water, so that should not be a problem either. Any thoughts on the possible side effect causing these head aches will be highly appreciated.