I've gone from a euphoric mania to a mixed state close together many times. I prefer the mix vs mania because when I'm manic I get myself into trouble. Though the irritability ***** for me its a safer bet. This whole high/mixed/low mood is so hard to deal with. You're not alone!
I am still going through my first manic episodes, and I have been back and forth from euphoric mania to dysphoric mania so many times now I can't even count. I don't just feel like a roller coaster...I feel like the whole dang theme park, lol. So yes very much so for me. It happens in the same day for me alot, or every few days if I get lucky. I also have anxiety at the same time so it is like tripple bad for me. You are defenitly not alone. For me it is like feeling every emotion all at once very intensely, and it is very overwhelming. It is very hard to deal with. I hope we all get it stabalized, and good luck to us all. :-)
I never experience euphoric mania; the symptoms are always dysphoric, yet there are very distinct types. For what it's worth, I often have several different types of mania/hypomania during a given week.