Would flunitrazepam works against my severe insomnia provided that I have developed a strong tolerance towards all benzos? And only Xanax works against my anxiety?

Im suffering from severe insomnia and went to several doctors who prescribed me several drugs like benzos to which I developed tolerance quite fast ( flurazepam, Clonazepam, lorazepam, lormetazepam, ) and other medications like clozapine, olazanpine, amitriptyline, which they never worked against my insomnia. Would taking flunitrazepam 2mg work against my insomnia ?