Im hearing you Sister.
I find forcing myself to get dressed properly helps. God knows I want to wear yoga pants and a hoodie every waking minute these days but I feel so much nicer in jeans and a cardi or a dress. And make up! Not lots, just a bit of mascara makes all the difference I reckon.
Having a cold wouldnt be helping, you poor thing! Try to look after youself, eat good food. Hope you feel better soon