Hi tash and Welcome!!
I'm so sorry your cousin is suffering so much. There is definitely something going on and if I were her I would keep pushing until she gets some answers. There is a possibility that it is linked to anxiety but I sure would find out first that nothing else is going on physically first.
First, her medical condition is no excuse for her husband to start drinking again. He needs to get some help and in turn that will help her.
Next, she needs a second or third opinion. Get her to a teaching/university hospital.
Finally, she also should have a counselor she can talk to. I'm guessing she feels very alone in her struggle. Invite her to come online here and meet the family of friends who will be happy to hold her up when she needs. No one needs to live like she is.
Good luck and keep us posted,
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Fibromyalgia, Ulcerative Colitis, Insulin dependent diabetic, collapsed disk, dermatitis herpetiformus, osteo arthritis in spine and other locations.
The only difference between genius and stupidity is that genius has it's limits. Albert Einstein: (1879-1955)