As far as I know lithium levels have to be monitored very carefully, because the therapeutic dose is quite close to a poisonous dose. It's safe as long as it is checked regularly. How long have you been taking lithium? Maybe the checks have to be more frequent at the beginning. Sorry, I don't know much about it, but one doctor was thinking of putting me on it and he explained a bit about it. Ask the doctor or your cpn about as, I think, belle suggested.
Hope tomorrow goes well. Thinking of you!
Ever tried? Ever failed? No matter. Try again. Fail again. Fail better.