Gas trapped in head. Suggest something?

I had sudden headache on top of head which triggered vomiting every 30 minutes. Even when nothing was in stomach the tendancy of vomiting continued. Due to lot of weakness, I had to be admitted in hospital, where the physician said that he tried every thing under his department but nothing relieved the pain. Even the painkillers were not working. I was referred to Neurologist where they performed CT scan where everything was normal. The neuro said everything was normal but still gave me painkillers mainly tramadol and paracetamol. I am having lots of burping even i ate or drink nothing. Currently the headache is same as it was in starting 4 days ago. The vomiting is in control with help of medicines but still 3-4 vomiting happens in a day. Is it possible that gas got trapped in my head? If so then what should I do? Please suggest something?