Hi.. Thanks for the query.. As per your question sharp short bouts of sever pain in upper part of mouth is pointing that you are suffering from neurotic pain like Trigeminal Neuralgia or Tic Doloreux.. Trigeminal neuralgia can occur due to disturbances associated with the fifth cranial nerve that is the Trigeminal nerve.. You need to consult a Neurophysician and get evaluated for the exact cause of the nerve induced pain as there can be some causes like the most common one is a large artery impinging over the nerve causing damage of the Myelin Sheath [ a protective cover over the nerve] leading to severe electric shock like pain.. Other causes are disorders like Multiple sclerosis, tumour compressing the nerve, physical trauma etc.. You can be advised to take drugs given to relieve neurotic pain like Carbamazipine that is the first line drug while others like Gabapaentin, baclofen, oxycarbazipine etc but in case if the pain does not subside then a detailed evaluation and tests like MRI SCAN can be done to rule out the underlying cause and treatment of the same can relieve.. If there is any artery impinging the nerve Microvascular decompression in which the compression over the artery is surgically removed is done.. Other procedures like Balloon decompression,gama knife radiosurgery, glycerol injection etc can be done to relieve pain.. Hope this helps.. Regards.