chronic nausea for 15 months, extreme weightloss, feel kidneys

I have a friend who has been really sick for the last 15 months with chronic nausea and headaches and she says she can "feel her kidneys" and it's not a sharp pain, she can just feel them. She wants to eat, she has energy, but the nausea keeps her in bed a lot of the time and she has lost so much weight it's starting to affect her internal organs and her teeth. She keeps trying to eat and some days are better than others. She does have gluten intolerance and eats accordingly when she can eat. She loves everything about her life, but the constant feeling sick has gotten her down. She's had every test the hospital can think of and they are baffled. She's been checked for parasites, tumors, had an MRI, swallowed toxic stuff so they could see inside her, the tests have been endless. She's tested her house for mold, lead, carbon monoxide, etc. She's also been going to see an acupuncturist who helps a lot with the nausea, but she's frustrated, understandably so and wants to feel better. Everyone is completely stumped and suggesting she go to the Mayo Clinic.

Any ideas?
Thanks so much