Cheryl, I have a very similar problem. I became so ill on a vegan diet that was, on paper, excellent, and following nearly two years as ovolactoveg, that my weight dropped to 88lb, my thyroid burnt out, my heart behaved so oddly that my doctor said it was irreversibly damaged, went into chronic migraine, clinical depression, chronic fatigue syndrome, and I had so many deficiencies that my 40 page lab report was covered with red rings! It took two years of intensive medical intervention to get me functioning again. Since then, 23 years ago, I’ve been doing research, trying to understand why it went so horribly wrong. I found out a lot about my body: I’m hypoglycaemic, gluten-sensitive, can’t eat nuts and legumes (except for small quantities of almonds and peanuts) because they trigger smashing migraines. I have exceptionally high needs for vitamin B12 and D3. I don’t convert betacarotenes well to Vitamin A, which explains the yellowish tint my skin developed – I looked jaundiced. Carnitine and taurine may also be issues.