Anxiety Support Group
Anxiety is a physical condition marked by intense and persistent feelings of distress, fear, angst or dread. General anxiety caused by routine day-to-day stresses usually passes quickly and is experienced by almost everyone at one time or another. However, such feelings that linger over time and are very difficult to cope with, and which lack a clear cause, may indicate...

Here's an example.
Worry - My family member is sick. I'm worried about them and their recovery, but I go about my day and carry on.
Anxiety - My family member is sick and I'm obsessing over what could possibly go wrong to the point that it is keeping me up at night, dominating my thoughts, and interfering with other things that I either need to think about or do.
One is dysfunctional and the other is not.
I have been noticing that I seem to use the words interchangeably, more for variety than a change of meaning.
Anxiety is a worry at a higher level, it's not just the worry that allows you to go through your day and just check on your friend once in a while, but anxiety is the worry that makes you not be able to function to even check on your friend.
Anxiety is to worry into distress mode.
Fret, concern, agonize, brood, bother, trouble are other words I've found myself using to replace worry in conversations with others.
Could we say that anxiety is escalated worry? A question of degree, as has been suggested? My goal is to arrest the anxiety in it's worry format?
With an Olympic League Worrier (OLW, the dyslexic owl?) such as myself, it could be accurate enough for psycho work to continue using the two words interchangeably. When I start to escalate, I escalate on rocket fuel.
Good way to work through it!