Pain experienced postoperatively tends to subside after a few days. It may last longer if the surgery was more complicated or combined with other procedures. However, most patients will feel soreness that is worse in a certain position, but improved when they rest and when they take the normally prescribed medication. Every patient has a different threshold for pain and they experience pain differently. Some patients need more pain medication than others.
However, you really really need to see your surgeon. If your exam is normal, then your surgeon can treat your pain and make you more comfortable. If your exam is abnormal and you are experiencing a complication, then your surgeon needs to determine what is causing the problem and how to fix it. This is something that has to be done by an examination, not a phone call. Hopefully this is still within the normal range of healing, but whenever a patient says "severe pain," it is not normal. Good luck!