hello thank you for trusting HCM dear are you anemic?any history of gastritis?? hypersensitive?? diabetic?? dear many causes for nausea after eating like simple gastritis to systemic disorders like CKD,anemia,hyperuresemia, hyponatremia,hypocalcemia etc... leg cramps may be due to iron deficiency, anxiety, excessive consumption of coffee and tea, restlessness leg syndrome etc.. dear until complete examination is done it is difficult to say what is the perfect cause.please consult your doctor he will examine and treat you accordingly. I think I answered to your question if you have more questions feel free to ask. take care