Hi
@JemmaW and welcome to DTP
It is very common for the Memory Clinic to make a diagnosis and then discharge - it happened to mum too. Fortunately, one of the leaflets I was given was about the Alzheimers Society and I found my way here, where there is vast collective knowledge and support.
Doctors dont like talking about what "stage" people are at as no-one follows exactly the same path, people can have symptoms from several different stages at the same time, no-one gets all the symptoms and there is no knowing how long people with dementia will be at one stage before they move onto the next. In other words, its impossible to plan for.
Make sure you have got the important things like POA and Will sorted before its too late and he can no longer do it. You can also apply on his behalf for Attendance Allowance, which is not means tested. Once he has Attendance Allowance you can apply for Council Tax disregard.
Other than that, Im afraid that its a question of dealing with the problems as they come along. My experience is that you just about get to grips with one problem and the next one comes along
. That is the beauty of this forum, though, whatever problem you have, someone will have seen it before and you will get lots of advice and suggestions.