The fever is a concern, but the concern is greater when it is associated with certain symptoms.
The most common cause of a fever that is going up and down is a viral infection, and a sore or burning throat is common with a viral infection. Coughing is also common with a viral infection. A cough also can occur with a bronchitis or a pneumonia, and these would be more of a concern if there is any shortness of breath, which you do not mention.
The most worrisome symptom that you describe, though, is that you feel like you are going to die, and if that is a sensation that you blood flow changes, that could be due to your blood pressure dropping when you stand up. This can occur with dehydration, which can occur with many different infections. But if the drop in blood pressure is significant, then it would be better to be seen.
If your pulse ox is 87, that would be another reason to be seen. It is possible that a pulse ox can give a falsely low reading in someone with a low blood pressure, because fingertips usually are the last thing to get blood. But with a reading of 87, it still would be appropriate to be seen.
If the oxygen level is accurately 87, that would be the equivalent of being short of breath, so would be worrisome for a pneumonia.
Therefore, it would be better for you to be seen urgently, and at this hour, that would usually mean in an emergency room.