Hi!
In my case, now expecting my 3rd baby...never had a problem with appoinments and midwives. If one goes on holiday there's always someone to cover for them, Im surprised you are only seeing one midwife in your area. As far as Alexandra Hospital is concerned, Im fine with them although not 100% happy, maybe thats what you get when things are free. Of course its different back in Philippines where you get your own room and have some privacy but you pay for it.
Good luck!