As Perna wrote, I think exploring the underlying jealousy in therapy could help, and looking for times in your past this happened. Maybe doing EMDR on it.

Also, do you think part of your anger is because this person is able to do this so easily, but for you, even though you go on a trip, you have trouble with the planning, the flying, etc.? It just isn't easy for you, even when you do get to do a trip. I think some of these things are anxiety, so there's a lot going on here--the jealousy and anger perhaps dating back to childhood incidents, plus the anxiety piece. Anxiety symptoms like these can be treated with very specific approaches in therapy (some Ts specialize in anxiety disorders) and can sometimes be helped with medication. The underlying childhood part is treated just like you are doing--longterm talk therapy using techniques like your T is trying--the EMDR, etc. I think it is also great your T has you filling out the form when you feel things like this. Just the act of writing and drawing can be a very effective coping mechanism to help you get through the intensity of the feelings at that moment. Mindfullness too--I know you are doing that to help you in the moment.