Hi, Thanks for writing your query. Atacand, which you have been taking for blood pressure can also cause headaches. You should drink lots of water as this will help in fluid maintainence of the body and will decrease the chance of hypotension. Other cause can be sinus headahes since you are feeling pressure or stuffiness in the nose also. Steam inhalation will help in relieving sinus headaches. I would suggest that you should first get yourself examined and investigated by an ENT specialist. Also get your eyes checked for refraction by an Ophthalomologist. Donot take any medicine even pain killers without consulting your doctor. I hope this is helpful to you. Thanks.