Yes, catching your anxiety early takes practice and the more I have practiced the more I am aware of those moments. Tracking your moods is such a good idea, I wish I'd thought of suggesting that! The more you analyse your self the better I reckon, you will notice the warning signs earlier and actively divert your attention to something positive, I think with practice this can become a mindset, it did for me.
It helps me to practice gratitude, it brings me satisfaction and calmness. I get a great feeling from giving thanks and love (in my mind) to the things around me. I am thankful for my family, the roof over my head, the nature outside, my job, my days off, etc. Knowing exactly what are the important parts of my life gives me somewhere to go when I need to divert my attention, spend time being active in the things that are most important to you.
Meditation has helped me a lot to train my mind to focus, on the positive and off the negative. It has brought me much calmness overall. For me it really is about becoming the boss of your own mind, persisting with bringing your mind about to where you choose. It doesn't normally feel natural when you start meditating, some people find it a challenge to get through the busy mind at the start, of course we don't stop meditating because we have a busy mind, that's why we are meditating! What you can do is grow new paths in your mind, slowly over time you can get off the old familiar worn tracks that lead to anxiety and cut some new fresh tracks that lead to calmness and happiness. I'm doing it and I know you can too.
Smilingminds.com.au is a good place to start for meditations or let me know if want to chat more about this, any time.