Welcome to our family. I am sorry to hear that your Lupus appears to be flaring right now. I do not know if vitamin B was keeping you healthy. There is no real connection between vitamin B alone and remission and/or mild symptoms. What medications were you taking?
It is important that you know that Lupus is a disease that is known to change within each of us. At times, our symptoms are very mild and at other times we can be unable to get out of bed. Lupus does not affect us all in the same way. We each have out own "relationship" with the disease so there is no universal path that we can follow with this disease.
I hope that you are able to get your current symptoms under control and that you can get back to a state of relatively good health.
Peace and Blessings
Look For The Good and Praise It!