I've been in the ER and observation in last couple...

I've been in the ER and observation in last couple of days, just to be told that nothing can be done for me. I was advised to make an outpatient appointment. I would like to know what can be done for me outpatient that couldn't be done in observation? I have two VP shunts and have had the same headache off and on since the most recent one was placed last year. I've been prescribed different pain medication for it, but I feel it's only a temporary solution. I'm truly disappointed in the level of care regarding this issue.