It gets worse before it gets better. The short rounds of drugs never helped anyone. Whatever you are going to do, whether it's drugs or herbs, you need a longer cleanse, like a year, but keep switching things.
Tell you doctor that you have severe pressure (not pain) in your head and blurry vision. It would be very neglectful if the doc didn't run the test. If you don't have insurance, go to the ER and they'll have to run it.