The pancreas is a gland in the body that I don't think could be injured just by falling - absent other significant injuries. I checked and found a long list of medicines and toxins that are listed as possible causes. Most are heartburn meds like tagamet, many are enzyme effectors, also targets of heartburn medications.
Here is a List: 3TC (Lamivudine), ACTH (Lamivudine), Acthar, Aldesleukin (Interleukin 2), Asparaginase (cytotoxic drug), Ausran, Azathioprine (Imuran), Calcifediol, Calcijex, Calcitriol, Calderol, Chlorothiazide, Cimehexal, Cimetidine (Tagamet), Corticotropin, EES, Elspar, Eryacne, Erythrocin, Furosemide, H.P. Acthar Gel, Hexal Ranitic, Hivid, Leunase, Magicul, Proleukin, Rani 2, Ranihexal, Ranitidine, Ranoxyl, Rocaltrol, Sigmetadine, Sulphasalazine, Tagamet, Tenofovir, Valproic acid, Viread, Vitamin D Analog, Zalcitabine, Zeffix.
Tramadol Was used vs Morphine in a study to treat severe chronic pancreatitis pain in 1999.
Yet has a relatively high incidence of nausea and vomiting of which the husband complains (nausea - hopefully not vomiting).
Tramadol is a serotonin re-uptake inhibitor. Many current 'Designer drugs' (made since 1995) use the blocking of serotonin to control pain. This pain relieving effect was discovered by accident in studies to find an anti seizure medication. Blocking serotonin re-uptake is also the preferential mechanism to treating depression and other mental disorders. To avoid his current symptoms he may ask his doctor to change his medication. However if his med levels are high the withdrawal may have to be managed as well.