I'm posting this to help anyone else experiencing this problem not panic like I did. A few days ago, I was feeling my stomach and noticed that I could feel a really strong pulse above my belly button. I had never felt this before and immediately started worrying about an aneurysm. I'm not skinny at all but have recently lost a lot of weight. Today, I couldn't wait any longer and went to the ER. My blood pressure and pulse were sky high. Doctor felt it too, so he did an ultrasound. He was very thorough and pressed hard so I was sure he was going to tell me there was a problem. My aorta measured 1.3cm; it's not even considered dilated until 3cm. I just have a really strong pulse which he agreed was why I can also feel it in other places (like the base of the neck) that most people can't..
So the Moral of my story is that yes there really are other reasons to feel your pulse in your stomach besides a AAA even if you're overweight.