I know that heat can help dilate blood vessels and improve blood flow, which may alleviate some of the symptoms associated with dysautonomia. Conversely, exposure to cold or vasoconstrictors/stimulants can exacerbate symptoms by further constricting blood vessels and potentially worsening circulation. In terms of ED management, while Viagra is a commonly prescribed medication for erectile dysfunction and may provide relief for some individuals, it's essential to consult with a healthcare provider before starting any medication regimen. However, its effectiveness and suitability can vary depending on individual circumstances and underlying health conditions.