To be so sad my neighbours are moving?

YANBU, I really get on with the neighbours and I will be upset when they move, and a bit anxious about who will move in, and whether we will get along (I know you don't have to get along with your neighbours, but it's lovely if you do). Do you know why they are moving? Are they looking to stay fairly local? It will possibly take a while to sell, which might give you time to get your head around it. Whoever does buy it will likely be pleasant too, I think it's more the norm to have okay neighbours even if you aren't particularly close with them rather than nightmare ones. I know it's hard, but please don't make them feel bad about moving, even though it's understandable you are upset; ask them if they would like to keep in touch when they move.

I can understand. There will be posters who come to tell you to stop being a snowflake/ idiot/ blah, but as someone who has suffered the same mental health issues it's not possible to switch off the feels. Sometimes it's better to let it out than try and hold it in.

I'm guessing you may also be anxious about who moves in. We went through this earlier this year, we were glad the neighbours moved out because they upset our entire block for a long time. We've been lucky, the adult and child who moved in are super quiet, you barely hear anything except when her phone alarm goes off early and the vibrating of it travels through from our ceiling. They certainly hear worse from our screaming 8yo.

No advice, just a distant, internet handhold.

You have become reliant on them..this will probably do you some good though it is sad but you can't and wouldn't have been able to have this "security blanket" forever it wouldn't be fair on either of you, try and motivate yourself to get to know more people etc easier said than done I know.

@Alittlebitfat25 do you get on well with your neighbour the other side? They might be able to offer some stability. It isn't stupid to feel that way, but I think whoever buys just having someone next door can often make you feel a bit more secure.

they are not neighbours, they are your very close friends.

Your new neighbours won't be close friends, not at the start, but they can be good neighbours too. Be friendly and helpful with them, but do not crowd them or overstep boundaries and scare them off.

you need to concentrate on other aspects of your life, with other friends.

@Alittlebitfat25 I am going through this myself. Our lovely neighbours who are good friends are moving soon. We have gone on holiday a few times and spent many happy times socialising over the last nearly 20 yrs. I will miss them so much and just feel sad all the time.
like you i massively struggle with change so it has hit me hard. We also have no drive so new neighbours always worries me on that score as well and I have convinced myself that we will have nightmare neighbours forcing us to move ourselves.
I am aware that I am losing perspective and will be better when they have gone now I think because I feel it is hanging over me.
So no real help to you but just to say you are not alone !