I live in a first floor maisonette with my husband, just turned one year old and dog. We bought the flat four years ago and discovered that the sound insulation is terrible upstairs and downstairs. Our previous downstairs neighbours had two (later three) small children and we could hear everything - we never complained as you expect to hear daily living in a flat. They moved out two years ago and our current neighbours (a couple, no children) moved in. They have always been noisy (music blaring, television turned up to full blast, shouting and arguing) but as they both worked full time then we tried to ignore it, to avoid bad feeling. Ironically, they seem to be noise averse themselves and the noise has increased since our daughter was born - turning on music if she cried, for example. They have also been aggressive and threatening to us - once coming around to scream that our dog (elderly, mostly sleeps, hardly ever makes any noise) needed to be put down. He had barked because their music was so loud that it was bothering him. As I’ve been on maternity leave and here all the time then it has caused me a lot of stress and really affected my mental health living here - I feel constantly on my edge and anxious. I feel like a terrible mum because if my daughter makes any noise then I’m always worried about the neighbours 
I was getting through because we have saved really hard for the last four years and had managed to find a beautiful house to move to. We’ve really struggled to sell our flat - it has taken us 18 months (including a sale that fell through) to find a solid buyer. We were due to exchange and move within the next few weeks when lockdown happened
Our neighbours are not working and the noise problems are now happening for hours everyday. It is really affecting me - sometimes I feel like I can’t breathe. My husband is a key worker and working long hours, so I have the worry about him on top of being on my own looking after my daughter. Our daily exercise needs to be a dog walk so for the rest of the time we are stuck indoors and I’m really struggling with the noise. I don’t feel we can approach them due to their past behaviour and I worry that escalating it to their landlord will make the situation even more worse. They know how bad the insulation is and they know that I am mostly on my own with a baby but they don’t care. I know lockdown is the right thing and I will obviously stick to the rules but I feel like I’m losing the plot - I can’t bear the thought of months more of this.
How can I get through this? Not sure how to cope at the moment 