This is an un-mediated Patient-to-Patient Forum only. This forum is for questions and support regarding
Autoimmune topics such as: Acute disseminated encephalomyelitis (ADEM), Addison's disease, Ankylosing spondylitis, Antiphospholipid antibody syndrome (APS), Aplastic anemia, Autoimmune hepatitis, Autoimmune Oophoritis, Celiac disease,
Crohn's disease, Diabetes mellitus type 1, Gestational pemphigoid, Goodpasture's syndrome, Graves' disease, Guillain-Barré syndrome (GBS), Hashimoto's disease, Idiopathic thrombocytopenic purpura,
Kawasaki's Disease,
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Multiple sclerosis, Myasthenia gravis, Opsoclonus myoclonus syndrome (OMS), Optic neuritis, Ord's Pemphigus, Pernicious anemia, Polyarthritis, Primary biliary cirrhosis, Rheumatoid arthritis, Reiter's syndrome, Sjögren's syndrome, Takayasu's arteritis, Temporal arteritis, Warm autoimmune hemolytic anemia, Wegener's granulomatosis
If it's not on there, here are some other ideas: You said you have a family history of aneurysms, so maybe you have one pressing somewhere on you central nervous system. It could be on your spine, or on the part of your brain that controls the right side.
A lot of diseases and things that effect people the way yours is, don't normally happen on one side.
Another idea is autoimmune that's attacking your joints, or nerves, but like I said, it shouldn't be one sided.
Since your eye is so slow to heal what ever it is could be in your blood, which makes autoimmune more likely.
Another thought is a false negative, which means you might want to consider getting all your blood tests again. I would also get another MRI, CAT or PET scan. Seen if there's any change. And maybe consider looking at a full body scan to see if you can find anything else.
I'm not entirely clean on how a CAT scan works, but in an MRI if you have a parasite, or something the same density as the surrounding tissue, it won't show up. So get a contrast MRI too.