Hi Tinkerbell, this is just my opinion, i am not medical.
I do hope things settle down for you, I would try and keep a note of how you are feeling - does it feel maybe like a high pressure headache or a low pressure headache?? If you have an adjustable shunt there might be some adjustments to be made with your neurologist when you go back to see them. so it might be handy to know.
I dont have a shunt but after lumbar punctures i use laying down to tell me if its a low pressure headache or high pressure headache. if after 30 - 45 mins of laying down it feels a bit better, then feels worse on standing it may be low pressure. Alternatively if you feel worse laying down you may have a high pressure headache.
If neither really fits it could be something else. I am cautious to say migraines, as IIH is a complex situation and i know in my case we spent a long time chasing migraines when we should have been looking at IIH, however migraines can play a part in the Headache big picture to, just ensure you feel the neurologist has a rounded view.
however its early days yet - some of the other guys who have shunts might come on and give you some advice, but at only 1 week in, you probably can give things a bit more time to settle down and do any adjustments. the main thing is the pressure is coming under control, now your brain can start recovering. make sure you list all these things to talk to your neurologist about.
Good luck and Much support