Hi secretgalaxy. It is frustrating when trying to keep mania down. I am not a psychiatrist so I will not suggest any meds. I can show you some links in the Psych Central archives that mention the meds you mention. If you want there is a search box upper right corner (scroll up) and you can do your own search. It is better IMO than waiting for someone with the same situation to post.
Psych Central - Search results for Seroquel, Latuda, or Benztropine