Try really intense cardio called interval training (No, I do not do it these days, but I know a lot about it). It would get the worries off your mind. You need to reach a high HR (=heart rate) for the thing to work. It will work wonders. It engages your physiology to help you. The cognitive approach of your T - "just say to myself you had your worry time." - is not working because it does not engage your physiology.

Ask your GP what HR is safe for your age and get going. It really should do wonders. And, you won't only stop worrying while having a high HR - the effect will last for hours afterwards.