Could there be a connection between gastric and neurological issues?

Several: The are several connections. Neurological disorders affecting the autonomic nervous systems commonly cause gastric issues. Often it takes a neurologist attuned to autonomic problems or a GI doc attuned to motility disorders to pick up the link. Best of health to you!

Yes: The link between the gut and the neurological system is only now beginning to be understood. The autonomic nervous system may be what links them together into syndromes and conditions. A few of the more rare conditions are porphyria, whipples disease, and more commonly celiac disease. These can all cause prominent gastric and neurological symptoms.