Happy Birthday OP
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Fantastic responses in this thread, such good advice from everyone that I would totally agree with. Small steps. Small steps.
I've been where you are many times and had a total breakdown over my 30th birthday. I just wanted to reassure you that you are doing all the right things for you. :) You are in the process of getting help, you are taking care of yourself despite it being like going through treacle, and you are even getting out and about, which is fantastic :)
I'm not entirely certain that what I can offer will definitely help the low times, as I find it variable myself, but when it gets really bad just take it one day, hour, moment at a time. Eat where you can. Order tasty/your favourite foods to keep as much appetite as possible. Sleep/nap if you can. Getting up and dressed and showered is good if you can manage it. Reading helps me, but I know you said you find it hard to concentrate for long. That's totally OK - doing something even for a few minutes is great.
Something I'm trying hard to do, but it helps when I do it - make sure you praise yourself for what you are achieving, even if it is just getting out of bed, sitting up, having a nibble, or even just trying even if you don't succeed. Out loud, mentally (I do it in my head). When depressed and anxious, that head-voice can be brutal and nasty, so it can be nice to hear praise from it instead. Plus, you ARE doing an amazing job, so it's good to remind yourself of what you are achieving each day (even if it feels really weird and fake at first!). Getting out and round the block and changing the linen when feeling like this is amazing. Now don't forget to reward yourself. :)
Finally, if you get those moments where you are feeling just terrible, as others have said, look after yourself - get snuggled up and comfy wherever you want to - be in whatever activity makes you happy - and remember that we are all here for you, thinking of you, and proud of you. The feelings will pass.
Much love to you, you are so very strong x