Here is the famous "I am not a doctor", but I know a lot about headaches. My wife is a drug rep for over 20 years, and she is a specialty rep that works only with neurologist on headaches. She has done lots of areas in neurology and she shares her knowledge with me...I could sell the drugs. Just like when you started getting wonky headed, there are lots of medical conditions that can cause that to happen, and doctors have protocols and test to include or exclude causes of your wonky head. Same way with headaches. Now you just had a surgery and then these headaches are probably a result of that surgery, but it is possible there might be another cause, and an MRI can answer lots of questions. Think about it...somebody just altered your brain just a few months ago, so thats a good place to start looking. My understanding is that the surgery you had can cause headaches because of the position your head had to be in or maybe they had to sever a muscle or some nerves. Any way, my point is, the doctor will use the protocol, the MRI, and probably figure out some type of resolution for you.
Technology is great stuff and we get the benefits to help us live longer better lives. I am a health nut, athlete, do all the things you are supposed to do to stay healthy, and I had a stroke April 2009. 5 days in the hospital found a hole in my heart, a birth defect, that caused my stroke. Had heart surgery May 2009. Had AN surgery March 2010. Yesterday I went to get my eyes checked, and I have cataracts so now I need implants in my eyes. And I really have a GREAT life, and I am glad we have all of this great technology. Now I won't have to wear glasses...life is good.
Don't let this get you down. There is a solution. You will not live you life with these headaches for much longer. Hang in there. Your life is about to get better.