So, just to get this straight, you've taken:
Guaifenesin at dosages sufficient for mild to moderate muscle relaxation
Hydroxyzine to keep you from puking your face off due to the guaifenesin
DXM at standard antitussive doses (well below what you'd need for a first plateau trip)
Half a shot of vodka to loosen you up.
Frankly, adding opiates into the mix sounds fairly sketchy; it's going to be somewhat potentiated by the alcohol, and I have no clue how that's going to interact with that much guaifenesin. As a general rule, mixing a muscle relaxant with opiates and booze is a very risky proposition.