Is there a clear diference between anxiety and stress? How long would anxiety need to be present to be classed as "long term" or harmful?

Stress causes anx. "stress" is when more is demanded of you than you can comfortably deliver. It stresses the heart to run upstairs; it stresses your mind to deal with loss. "anxiety" is worry or nervousness, often due to mixed or confused feelings. E.G., whether to approach or avoid someone. Anxiety is an inevitable part of life; it's harmful if severe, or gets in your way on a regular basis.