Thanks guys, it makes me feel better that other people understand
after I had posted on here earlier, my manager phoned me, quite annoyed, saying that it was a problem that I had phoned in again, as they had had difficulty rearranging the work that I was due to do tomorrow. Unfortunately I can't do my job from home. (When I discussed it with a month ago, she didn't come up with any other solutions, except the work policy. I talked to HR as well, he suggested that I keep some annual leave next year for the winter, to be used at short notice if there was snow-however my manager wasn't keen on that idea.) I've now had six days as unpaid leave because of the snow, which I accept. Fortunately (for everyone) I now have some annual leave for about a week so hopefully the snow will be gone by the time I go back to work.
However, she was not happy and said there was another aspect of the job related to paperwork that need to be looked at. She said that we needed to have a meeting, to discuss things and discuss whether I was "fit to do the job". They had previously put some' reasonable adjustments' in place for me, which made a difference and for which I'm grateful.
I've been feeling exhausted-mentally and physically. Over the last two years, most of my annual leave has been used on hospital appointments and investigations (that's our work policy). As a result I don't get much rest time and I think my health is suffering (if there was any decent part of it left

) I put all of my energy into my job but with the best will in the world, I guess that cracks will sometimes show.
I had been looking forward to my week of annual leave (with no hospital appointments

) but now I know I have to prepare for this meeting with my manager which I'm not looking forward to. I know that it will be useful to discuss things, but I find situations like this hard. Also I am worried that if I say I'm finding things difficult, they will say that I'm not "fit to do the job" and find grounds to dismiss me.
Sorry to have a moan. I'm not in a very good place at the moment. I need to keep my job but I need to look after my health as well and that balance seems really hard to find.
Thanks to anyone reading this

-knowing that I am not on my own, really does make a difference.
Bendy