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I'm so sorry to hear of your discomfort due to this fall. I will do whatever I can to help answer your questions:
A pneumothorax is air that is trapped next to a lung
The outcome of pneumothorax depends upon the extent and type of pneumothorax. A small pneumothorax will generally resolve on its own without treatment.
If only a small portion of your lung is collapsed, your doctor may simply monitor your condition.Series of x-rays will be done to keep a watch.Tis may take a week or two.
If a larger area of your lung has collapsed, it's likely that a needle or chest tube will be used to remove the air.
Yes,you need to get it treated at ER but as your symptoms does not get worse,I do not think that there is need to rush to ER.You can wait till the morning.
Just keep an eye on your symptoms like severe chest pain,great discomfort in breathing or any other symptom that cause great discomfort.
Otherwise you can wait till morning to go to ER & treat accordingly.
Hope this helped.
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Thank you *****