Give me a hint. What kind of hassle am I facing if doc suspects aortic aneurysm? What is required to diagnose?

Depends. The work up would include first an abdominal ultrasound to evaluate the size and then a ct scan. The next step depends on the size of the aneurysm. An abdominal aneurysm places stress on the wall of the aorta. The risk of rupture for an AAA over 5cm in diameter is approximately 20%, over 6cm approximately 40%, and over 7cm over 50%. Rupture of an AAA carries a risk of death up to 90%.
Ultrasound. An abdominal ultrasound will show if there is an abnomality of you aorta. It takes just a few minutes to perform and is very accurate.