My stomach pulse and fluttering, worried about an aneurysm!?

Probably nothing : Very thin patients can often feel their aorta and become concerned that it represents an aneurysm. At 30 an aortic aneurysm would be really unlikely unless you had a connective tissue disorder like marfan's or ehlers-danlos syndromes.

Unlikely: If you are thin you may easily feel normal aortic pulse. If heavy, it may still be transmitted to abdominal wall. Ultrasound is a good non invasive screen.