Could I have appendicitis?

I have had this tender spot in my lower right abdomen for about 3 days. It hurts only when I push on it, I though it was gas so I got mylanta and exlax and those two things did their job, but the tender spot is still there, it feels alot like gas, but trust me, if it was gas I think it would have been long gone by now since Ive been taking gas relievers! Its not bad pain just very very uncomfortable and my chest also hurts right in my sternum. I have no idea what this is and its getting very annoying. Someone please help me! LOL Thanks in advance!