Headaches

Please could someone give me advice , I have a 14 yr old son who has just gone for a ASD test , I believe he has High functioning autism with hypersensitivity.  Over the last 5 weeks he has been suffering with severe headaches every day ,  almost like migraines  (doctors say not typical migraines) paracetamol and ibuprofen don't work .  The other day he said oh mum the pain stopped for just a min , I said that's great , but he was like no mum you don't get it , the pain went completely , my head always hurts , it always has . Now this concerns me . What does he mean ?