Hi Claudette,
I had my SAH in Nov 2013 and had daily headaches afterwards, I've also been hospitalised with headaches twice since my SAH. I was referred to a neurologist who specialises in headaches and apparently it can be migraine related, so I was prescribed migraine prophylactics. It's definitely worth asking to see a headache specialist if there's one near you.
Other than that, like everyone says, low stress, plenty of water and exercise help. Meditation works for me, but we're all different.
All the best!