My vets can't figure out what my cat has, but they are torn between IBD and Lymphoma. I need alternative help.

My cat is 16, we thought she had a host of different diseases from hyperthyroidism (because she was ravenous and then always very hungry and still is) to pancreatitis (because she has constant diarrhea) well I ran several bloodworks including one to see if she had a pancrease enzyme insufficiency.. so far they don't know what she has!!!! They think its lymphoma or IBD. They said if its the "L" then she has only 6 mos. to live, but she started losing weight last year, so is it possible its not?? In the interim, she's still losing weight, very active, getting a little weak, but not too bad, always meowing, she was shaved and her hair won't grow back after 6 months, the vet ume its because of her compromised immune system. She has reoccuring bouts of liquid diarrhea..the constant meowing, wanting my attention like crazy, weight loss. She has responded well to a pancreas enzyme I stir into her food, even tho her tests turned out she creates 2 many enzymes. I need alternative med hel