Lithium and restless legs syndrome.
I mentioned before that I had been told that RLS can be aggravated/caused by Lithium medication but I know that it isn't on your list of potential suspects.
I've done a little research and I've found some paper that suggests there is a link (not all can be opened unless you have access to the platforms/journals) : -
sciencedirect.com/sdfe/pdf/...
pubmed.ncbi.nlm.nih.gov/177...
uspharmacist.com/article/un....
Hope it might be of interest to some