Nitroglycerin is for people with angina, angina is almost a squeezing like chest pain that occurs when a part of your heart doesn't receive enough blood flow. Nitroglycerin is a Vasodilator it works by soothing and relaxing blood vessels so it's easier for blood to reach your heart, relieving some work your heart has to do.. furthermore relieving the chest pain..
if you do not have chest pain and take this medicine you can expect an abnormally fast heart rate in general. This can cause panic, weakness, dizziness, and flushing almost as if your heart was beating from working out, minus the working out part.
If you're overdosing on nitroglycerin and intake a dangerous amount you can expect headaches, confusion, blurry and/or double vision, vomiting, short or shallow breathing and cold or sweaty skin...
If you do not have angina or were directed by a medical professional to take nitroglycerin I suggest not taking it at all, any medicine can be dangerous without reason. If you have already taken some and are feeling anything abnormal please tell someone or seek help if needed.
Fatigue is temporary loss of strength and energy resulting from hard physical, MENTAL, or nervous exertion (stress). Hope this helps!
