I was diagnosed with a Celiac artery aneurysm last October. Same size as yours. I did go to a vascular surgeon and he is doing a watch and see approach. I went back 6 months later and they did an abdominal ultrasound. My aneurysm was 1cm larger but he said that most likely the difference was do to who was taking the measurement as 1cm is extremely small.
Anyway... I too was very frightened but I decided that I may have had this for years without knowing so I relaxed knowing that this is small, that whatever is going to happen will happen and that most likely everything is going to be fine like everything in life.
I still have pain/discomfort on my right side that everyone dismisses. In my case, I will go back in one year and get another abdominal ultrasound.
My suggestion is to try to relax as that is the best thing for your body. Easier said than done but now that I've known about this for 10 months I don't think about it much.
I think the only way they know that it's getting growing is by getting those abdominal ultrasounds.
I'm curious if they think your pain is from the aneurysm?
When you say your chest had pain, are you saying your rib area (that's where mine hurts... Under my ribs ...Like I'm getting squeezed)
I have no idea how dangerous the wait and see approach is but it seems rather standard from what I gather. I was told they don't want to do anything unless it is 2cm or larger. Let me know what your surgeon says as I too am very curious.
Also let me know if they say the pain is related.
Best wishes!