What causes inflamed blood vessels, bloating and stiff neck?
Sorry to learn about your medical challenges.
Yes hormones can disrupt menstrual cycles. And in view of all the other symptoms you are experiencing I suggest you undergo a comprehensive check up that will begin with a thorough physical examination.
When I see someone like you in my practice I refer the patient to the ER for the severe headache itself, where typically a CT/MRI scan of the brain is performed. Checking the blood pressure is vital to make sure it is under control. Very high blood pressure can cause severe headache too. And treating that can avoid an urgent trip to the emergency room.
Once emergency problems are dealt with, then a systematic evaluation begins that should include the following tests
Liver function tests
Kidney function tests
8 am cortisol
Further choice of tests will be determined based upon the findings on physical examination and the results of the first round of testing.
Some problems are reversible such as a high prolactin level can be treated with oral medication and the periods often normalize.