Hi TheOriginalMe,
It sounds like you've been so let down by the resources out there, I'm sorry

But if the pdoc can't up your meds could you talk them into adding something else or trying different meds?? Otherwise occasionally G.P's can add something (depending on the G.P of course!!) in consultation with your pdoc, so maybe worth trying???
Might go nowhere, I'm sorry, but just a thought.
And if you're not getting much support on the NHS maybe you could try some charities like MIND or Rethink for support, depending on what they've got going on in your area.
And work...........is there the possibility of cutting your hours??? Things sound hard enough for you without the pressure of work
as well 
but maybe less hours???
But regardless time off, job or no job........you ARE NOT a failure!!!

Look at what you're having to cope/live with, right now!!! Just
wanting to work is amazing, but if you can't that
absolutely does not make you a failure!!!
So all the help you can get, hey (??) helplines, crisis lines, and please keep sharing with us, we're here for you too
Alison