Sorry to hear your difficulties.Chronic headache can be due to various causes.Tension headache
are the most common primary headches,followed by cluster headache
and trigeminal neuralgia
.Firstly ENT causes and eye causes need to be ruled out, as causes for you problem.Usually a CT scan
brain is done in cases of chronic headache to rule out any serious intracranial causes.Once that is ruled out only,diagnosis of tension headache or migrane can be made.
But if you are having real money issues,CT scan may not be an emergency.If ENT and eye causes are ruled out,you can try prophylactic migrane treatment and find out if it works for you.If you can feel the difference,they you can buy some time.And only if you still have no relief go ahead with the CT scan.