Have my buds gone on vacation?! For about the last 24 hrs, none of my vapes seem to taste like they did - it's like everything is dulled out, very little flavor. Am I losing my mind??

Yes it is unfortunate but your taste bud's are indeed on vacation. It is pretty common early on shouldn't last more then a day or so. You can wake them up by switching to some other really strong flavor. A lot of people use atomic fireball for this. If you see Vapor but taste nothing its a good bet that's what's up.
I've had this problem too many times to count. Every time, I try to pinpoint ways to end it. I find mellow tasting foods/drinks help. Milk, cheese, bread. The last time was 3 days ago, and I tripled my water intake and that helped a lot! I also suggest avoiding spicy foods and carbonated drinks. Just my 2 cents.
I've been doing this for awhile and taste bud burnout is frequent with me. That's the reason I generally have 2 - 3 flavors going at once at any given time. Even with that I still get bud burnout from time to time.