At least you've got some time to yourself then today :) If it were me, after walking the dog, I'd sit myself on the sofa and watch rubbish TV (or episodes of Dawson's Creek as my friend has just lent me the box set!).
School starts tomorrow here as today is a PD day (like an inset day or 'Baker' day as they were first called when the teachers go to school for training or something). So as a really special treat I'm taking DS1 and DS2 to McDonald's for lunch today as they are feeling a bit sad that the holidays are over. DS3 will come with too of course but eat a home-made sandwhich or pasta salad!
Hope your call comes soon... don't worry about the CMHT receptionist. She probably feels sorry for you for feeling so rotten today. Nobody thinks you are an idiot and your DH is probably worried about you rather than disappointed. He sounds such a lovely DH. Mine does the same sort of thing - he sometimes makes up scenarios to calm me down about me and the DSs splashing in puddles in our wellies and going home for a hot chocolate by the fire :)
I think you are going to be ok. If it were me, I'd probably get some more diazepman from the doctor, explain everything to him / her, and take 2 tonight, 1 the next night and the 1 the night after that, and then try again without the night after that, perhaps 1 again the night after, and see how things go. I think you need a break and you need to get your confidence back and the anxiety down again. You will bounce back.
I don't know much about ADs but perhaps there is something you can take that is safe while TTCing / pregnant but is slightly sedative? I'm sure Lelarose on that other thread started taking something a couple of months ago while she was pregnant but I don't know how it went or what it was she took. But I don't think this blip, or whatever it is, means you cannot try for another baby.