Think of an aneurysm like a huge bulge in the sidewall of an car tire. There's no amount of wishing and hoping and vitamins or lower blood pressure that's going to unstretch/shrink the aortic wall once it has been stretched. Once the aorta starts to bulge only one of three things can happen: it can stabilize (not usually), bulge larger (usually), or burst (eventually). Regular CT scans are to monitor for the progression of enlargement of the aneurysm. Surgery is there to repair the aneurysm before it dissects suddenly.

Think of it this way: If you saw a huge bulge in a water main, would you ignore it hoping it won't burst or call the water company to come fix it immediately? Now image that water main is buried deep in a cage underground. It will take time to open things up and make the repairs. It's going to suck to be without water during the repairs, but it is a lot better that waiting for it to burst and then trying to fix it. Once it bursts, the damage is done. Peace.