If it is the carpets and curtains that are making the room smelly, I really would follow the advice above about getting them out and replacing.
If you can get that £50 - £60 pounds saved over the next few weeks, knowing that you can have lovely fresh new carpet soon, you might start to feel better even before you can actually afford to do it.
And then, once that bit of offcut is in, oh, the luxury of new carpet underfoot, even if it isn't top quality stuff! If you make sure you choose a lightish neutral colour, that alone will make a good start in lightening the feel of the room overall.
Our back room is also north facing, but we have patio doors so maybe a little lighter than yours? Just to say that I have painted it in Wilkos Organic Green recently, and it looks gorgeous. An alternative to white just for you to consider. Though a poster upthread mentioned Dulux Timeless, which a friend has recently used, and is a lovely warm (but bright) cream.
And in the meantime, I would highly recommend bunches of daffs as a previous poster mentioned.
(It's really important that you make your new safe refuge into a lovely nest that truly feels like home, so I wish you all the best in this next phase.)