Blood tests don't tell everything about the pancreas. You need better medical care. Where do you live? Is it rural or in a city? Are you going to an ER related to a University? Are you on medicaid?
I'm having a hard time with you losing 22 pounds, being in the level of pain where you scream when you eat, and the medical people telling you they can't find a problem. Something tells me that you need immediate intensive care. Do you have a friend or family member who can go to an Urgent Care or ER with you and support you to get the care you need? BTW, if Urgent Care can't help you they can often refer you immediately to the ER where they will pay attention to your problems. You are going to have to fight to get the care you need.