Eye, throat, mouth, neck symptoms - need diagnosis and relief help

[dupreefam]

My husband has had new symptoms for a year that have gotten worst over time. First his left eye lid would close mostly at night. Now it affects both eyes which clamp closed, throat clearing, mouth opens and closes repetitively, and neck muscles are tight. Eye dr said it was Blepharospasm and gave botox but that did not help eyes closing, next neurologist diagnosed as Ocular MG and the medication given did not make any difference, 2nd opinion neurologist diagnosed as tics and this medication tetrabenezine is not working either. Symptoms remain. Husband has low B-12 on labs and he is taking more dosage of B-12 to get levels up. We are not sure if any of these diagnosis are right and he does not have relief yet. Any ideas?