Headaches with aneurysms are sudden and severe. Your headaches have lasted long enough that it is really unlikely that it's an aneurysm. They re-clot and re-rupture in less than a week and symptoms progress quickly. Within a couple of weeks, you would be near comatose or worse.
That said, it's not uncommon for headache problems to start suddenly without an obvious cause. You should try to get a diagnosis for your headaches and then treat them accordingly. In 90% of cases, headaches are either migraine or tension. There are many ways to treat such headaches.
Headaches are scary, but rarely signs of serious problems in the brain. Take care.
-kerrie