I don't know if your providers will do this but I avoid the clozapine running out because of slow communication by having my scripts written for 350-400 mg. I take 400 mg for a few days if I get manic so there is some slight need for that but it's usually only once or twice a year. But that gives me extra in case there is an issue.

I don't know if going now for labs is going to show lithium toxicity unless you've had lithium (I may have misunderstood that you've not). But if that happens again you should go get checked at the ER. I loved lithium but it loved to make me toxic and I tended to not get checked until my levels had lowered themselves from being sick. The one time it made me hallucinate and I was sent to the ER and had a test before I started vomiting/diarrhea my level was very high and I needed to be admitted to medical for fluids and monitoring electrolytes.

Hope you feel better soon.