Not a lot, but has happened - they do get bussy and forget things, it's also possible they did try that other guy, but (has happened to me as well in the past) they don't accept your insurance, and don't know anyone else so you will need to find out what the specialty is..(But it's been over 20 years since one doctor set me up themselves to talk to a different one, except for when actually in the hospital.
And when to take pills, I rarely get told that either, usually it's once a day, twice a day, Three times a day, exc. and SOMETIMES you might see something like "With meals" - but typically you figure it out. Basically the way I do it is take the average time you wake up and make that the first pill, in the case of multiple pills in the same day, figure you are awake an average of 16 hours per day, so 16 divided by the number of doses per day, tells you how meany hours between each dose.
Make special arrangements for special medications - like my sleep medication, it's one dose per day (as needed) but obviously it's at bedtime due to what it dose.