From what I've seen (and experienced myself), that "drunk" feeling is fairly common with MS. For me it comes and goes, but the "drunk" and "confused" feelings, often together, happen to me more often when I'm too warm, too tired, or both. Stress gets me confused also.

With MS, it ALWAYS could be that we will end up in a wheelchair soon, but it USUALLY doesn't happen. PPMS is a different deal than RRMS, which many of us have, but even still it isn't as rapid for some as it is others.