How long after cochlear hydrops diagnosis did you develop vertigo?

Have had cochlear hydrops for about 6 months now hearing drops to about 25db then returns within 24 hours. can’t seem to pinpoint triggers and it comes and goes with no rhyme or reason. Was wondering if anyone was diagnosed with hydrops then it progressed to menieres? how long it took you guys to develop vertigo and how bad was your hearing before it developed to menieres?