Transition periods
Are such a pain in the ass.
What should I do next?

That first line is iffy, though. Seems more like six syllables than five.

Yeah, pe-ri-ods, I'd think. (Although in English, you tend to let the consonant with the previous vowel, so that would be per-i-ods). What about "Transition phases"? RhymeZone: period synonyms

Stereo: yeah, that would work.