Hello Blue Bird,
You're not alone in feeling that anxiety can take over your life and that you are unable to calm yourself down even though you feel your fears are out of proportions, that pretty much sums up anxiety!
Are you on any medication at the moment? I know medication isn't the answer to everything and for a long time I refused to take any medication myself but after experiencing very difficult times recently, I have decided to give myself a break by combining medication and therapy (haven't started the sessions yet but have started the ball rolling). Some medication can help especially if you find that your anxiety is affecting your sleep as you are suggesting, I myself can't imagine functioning if I wasn't able to sleep, thankfully (and it's a miracle!), regardless of how high my anxiety is, I'm always able to sleep, touch wood.
Also, it might be that actually something needs to be done about your neighbours? If they are being noisy and it's bothering you then it might be worth calling the police or the council about it if the issues can't be resolved calmly by chatting with them? I can imagine these issues would be stressful and you might find it helpful to talk these things over with your GP or a therapist? It might be that you have a deep seated fear of confrontation which triggers your anxiety?
These are only suggestions and I hope you feel much better soon and are able to get some sleep,
All the best