I had what seemed to be an anxiety attack today. i started feeling off, extremely anxious, felt like my vision was going, i felt like my heart was stopping or flipping i cant even describe it but i calmed down. could this have been something else?

Yes, it could have been a heart irregularly beating or beating fast due to an irregular beat. Best to see your physician as soon as possible and describe your symptoms, get an EKG plus have a holter test, and assess some blood tests.

Although most likely a panic attack, there still remain some additional potential explanations. Yes, see your doctor and get this pinned down.