I'm going to guess that the last 3 medications, the valium lyrica and baclofen are taking away the euphoria. My rationale is that alcohol affects gaba-a, gaba-b, and is an nmda antagonist. The valium desensitized your gaba-a receptors, baclofen desensitized your gaba-b receptors, and lyrica seems to affect both to a degree, but I'm not positive on that one. Discontinuation of said meds, and probably a week or two later and the euphoria should come back.