Well, yes, I have to say that it is normal to have headache after you have taken the surgery. Generally speaking, there are many reasons which can lead to headache such as cold, even the bleeding and injury in your brain. But on the other hand, you should know that eye strain can lead to headache too. And after you have taken eye surgery, your eyes will be sensitive. And in common, if you overuse your eyes, eye pressure will be higher, leading to eye strain. And then it will affect your brain nerve system, leading to pain and headache. For your situation, you are not supposed to take some heavy exercises. Also, do not watch tv and computer for a long time.