Yes
no
I'm a little confused about the barbiturate test because there's no evidence either of those will cross react with the barbiturates test...but you should have tested positive for benzos because both of the drugs you are on are benzos.
Sudogest, which contains pseudoephedrine, is not chemically related to barbiturates and typically would not cause a positive test result for barbiturates. However, some drug tests might have cross-reactivity or false positives due to the specific testing methods used. It's always best to inform the testing facility about any medications taken prior to a drug test. If there's any concern, retesting or using a more specific test can help clarify results.
It can if they look for it
No.
Neurontin is not a barbiturate, so therefore it will not test positive as a barbiturate. Neurontin will not show up at all unless specifically tested for.
.....yes.
Barbituates Barbituates
No, they will not.
nighquil
Buspar(Buspirone) drug class is azaspirodecanedione
No, It is of the piperazine and azapirone chemical classes. It is commonly used to treat general anxiety and mental health issues. Read more: http://www.prescriptiondrug-info.com/drug_details.asp?title=Buspirone&page=1000270&ad=true