Is this anxiety?

Lately I think I've started having anxiety or panic attacks, but I'm not sure. Twice this week my heart began racing out of control, like I was afraid of something but I don't know what. Along with that I had a sinking feeling. Kind of a very unworldly, lonely feeling. I was really concerned that I might be going crazy. I thought about seeing a doctor but am more worried just be put on some medication. I found a list of anxiety symptoms at www.selftherapy.org , which has calmed me down a bit as it's sounds quite like what I am experiencing. Has anyone every tried that program? Or have any other suggestions? Does this sound like anxiety?

It could be anxiety hon, do you remember what you were doing or thinking about when this occured?