Living with anxiety

http://motto.time.com/4269148/anxiety-disorder-brussels-attack-terrorism/

I think we often believe we should not  have bad  feelings like panic and anxiety  but it seems the best way  to cope is to accept them.If that is not possible we need to get help.But how do we know how much we can or should tolerate?We may complain but that about refugees in camps? How do they manage?Or people who lose a family member or friend in an accident which maybe they caused by poor driving?We are all different.