If you are feeling weak for several days and are unsure if you should go to the emergency room, it is important to consider certain factors. If your symptoms are severe and do not improve with rest and hydration, if you experience dizziness, difficulty breathing, chest pain, or confusion along with weakness, or if you have other concerning symptoms, it is advisable to seek medical attention in the emergency room. It is always better to err on the side of caution when it comes to your health.