I feel like I have heartburn but it goes away mostly when I sit or lay down. When I stand up it aches horribly?

It sounds like you might be experiencing symptoms related to acid reflux or gastroesophageal reflux disease (GERD), which can cause heartburn that worsens when standing or sitting upright. When you lie down, the pressure on your stomach decreases, which may alleviate some discomfort. However, it's important to consult a healthcare professional to evaluate your symptoms, determine the underlying cause, and discuss appropriate treatment options.