I had 2 fainting episodes in 1 day. I. Feel weak and fatigued. I flew yesterday 2 times. Could it be related? I have a congenital heart murmur as well

Best checked soon. Could be dehydration and vasovagal syncope. However may be something more serious especially if you have had a structural heart problem. Best to get it checked right away.
Might be serious. Fainting twice and having a previous heart probl might be seriou you need to see a cardiologist soon.
JHS. 41y fem. has recurrent "faints" seemingly related to event, air flight, causal of anxiety & presumably tachycardia. About 15% of women have benign Joint Hypermobility Syndrome, JHS, which has known relationship to mitral valve prolapse, MVP, w. proclivity for syncope. An echocardiogram is indicated to document MVP. Many JHS women have frequent dizziness upon standing, PMD, IBS & pelvic/back pain.
Fainting. yes it could be related and also it is important to know what kind of congenital heart defect you have.

Related Questions

I was recently diagnosed with a heart murmur. I have been feeling faint lately. What kind of test should I take to get a better what kind of test should I take to get a better diagnosis

Echocardiography, . Echocardiography, an ultrasound of your heart, is the gold standard for evaluating murmurs. A murmur is nothing more than turbulent blood flow through the heart and can be caused by a variety of things, ranging from abnormal heart valves to holes in the heart, to abnormalities with the heart muscle itself. An echocardiogram ("echo") can evaluate all of these items at once, and does so without radiation, is non-invasive, and as medical tests go these days, is relatively cheap. If you are feeling lightheaded or dizzy then it is particularly important that you be evaluated soon. I hope this helps! Read more...
Maybe none. A murmur is not a diagnosis. It is a sound. It can be innocent and mean nothing, or be a sign of a disease process. The doctor who heard it should tell you one way or another if they are concerned it is a disease, they will refer you to a cardiologist or order an echocardiogram. An echo is only necessary if your doctor thinks you have a problem. Feeling faint can be a lot of things. Read more...