My general rule is: if you're questioning whether it's anxiety, it probably is anxiety!! With fp it's pretty obvious that it's the real deal, you just have this unique feeling of n* that differs from anxiety n*. The fact that you found out about your friend's case could have easily triggered the n* you are feeling now. Try having a mint or something to distract yourself, mint-flavoured things always help me get rid of n* when it's anxiety-based. You're fine don't worry!