I can totally relate to this, as I spend hours looking up diseases on the internet, for myself and others...And any little symptom I think I have, I look up the worst disease it could be, and convince myself that I have it...I am filled with so much anxiety every day about what possible disease I could have out of so many...I am now obsessed with taking my temperature (as you are with your blood pressure), and take it 4 or 5 times a day or more to see if I may have a fever which would signify some hidden illness! But it goes from one disease to another..One day I am obsessed with my teeth (mouth cancer, etc), then another time it can move on to stomach problems, headaches, etc., and am always convinced I have a deadly disease....I find if I stay off the internet and stop searching for diseases, I am much better, but its almost like I am addicted to it...I can go a few days, but then I am back at full force...Any suggestions would be helpful..Thanks!