I took a bad reaction to a Vitamin B3 Niacin tablet nearly a year ago now..the flushing effect happened. I took antioxidants etc as i was told that it had affected my blood. Ever since every little thing i obsess over and freak myself out. When i am busy working away or doing things i am obviously not thinking of how i feel therefore i am ok, however at night time when i start to relax or any other time during the day when i get time to sit down and think i start to get not well. I have feeling were i feel like i am just going to get dizzy and faint, i sometimes get a fast heart beat, like the start of a panic attack however after 10 mins i am back to normal. At the moment i had a dull ache in my stomach which ive had for 3-4 days not and goes down to my feet....probably completely normal...however i freak out and obsess over and google my symptoms...which is not good, because at the moment i have a life threatening illness! haha. Is this anxiety after what has happened to me and because my brain is in overdrive its making me think im unwell? Please reply someone to put my mind at rest.