It can be muscle injury, or ligament/soft tissue injury. A clinical examination is necessary and if required MRI can also also be advised.
Considering the severity of pain, i advise that you should not delay and get it checked in ER.
To treat this condition doctor advise for medications. These are-
-Non steroidal anti-inflammatory drugs like- Motrin, Naproxen ,Aleve.
, specifically tricyclic antidepressants, are very helpful.
-Muscle relaxants, are also very helpful in such cases.
Also cortico-steroid can also be advised.
I advise that you should not delay and rush to ER ASAP.
Good luck and take care.
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