I've got taken Zanaflex (tizanidine) and baclofen but neither of them work. Are there alternatives?

Yes. Both are actually good medications, but there are other options. While i don't recommend jumping to ativan, (lorazepam) it is an excellent muscle relaxer. Have you tried dantrolene? Its not a great first line but can be used. Botulinum toxin is excellent with injections as well.