I also have headaches just about every day. Usually, I notice them first thing when I wake up in the morning. I think many times it's due to dehydration. Also, when you take medicine for a headache, it can many times cause rebound headaches.
I get migraines with auras and the only thing that helps me is Excedrin Migraine. However, I had a neurologist tell me once that sometimes the migraine will come on because my body is craving the Excedrin. Almost like an addiction. Once I take it, the migraine subsides because my body got what it was craving.
Unfortunately, that's the only thing that helps me so I still take it.
I, also get the throbbing/dizzy feeling when I go from sitting to standing or bending over. I think that is completely normal. Some days seem worse than others but I don't really think about it.