Advice anyone?!!

My daughter is 8 months old and since the day she’s been born me and my fiancé have had the worst 8 months since we’ve gotten together 5 years ago! I just can’t seem to wsnt to be around him, I don’t want to kiss him, cuddle him, everything about him just irritates me and can’t being myself to even have sex with him we havent had sex in about a month! I’ve been diagnosed with postnatal depression and got counselling and anti depressants but I just feel that the way I feel towards my partner is so much more than that and I just can’t seem to snap out of this feeling. I don’t know what to do i really don’t we argue every day I’ve reached the point i just care if we just finish for good, only been since my daughter has been born😢