Mayo Clinic - Angiotensin Converting Enzyme, Serum..
"Currently, it appears that ACE activity reflects the severity of sarcoidosis: 68% positivity in those with stage I sarcoidosis, 86% in stage II sarcoidosis, and 91% in stage III sarcoidosis. Serum ACE also appears to reflect the activity of the disease; there is a dramatic decrease in enzyme activity in some patients receiving prednisone.
Other conditions such as Gaucher disease, leprosy, untreated hyperthyroidism, psoriasis, premature infants with respiratory distress syndrome, adults with amyloidosis, and histoplasmosis have been associated with increased levels of ACE."
I hope you don't mind, but I have a lot of questions to ask; once I have those answers, I might be able to help you.
Do you have thyroid related test results you can post so we can see what your actual thyroid hormone levels are? You should have Free T4, Free T3 and TSH tested.
Are you taking a replacement thyroid hormone medication? If so, what medication, dosage and how long have you been taking it?
Have you had antibody tests to determine if you have Hashimoto's Thyroiditis?
Do you know what your vitamin B-12 level was prior to taking the supplement? Your level isn't that high and B-12 isn't toxic, so that's not going to hurt you.
Has anyone suggested sarcoidosis as a possible diagnosis for the rash, eye and other problems, since you have the elevated angiotensin converting enzymes?