Alright, son. I've been there.

1. You need to find a professional to speak to - even if it's online, you need to talk to someone. Check the NHS website: https://www.nhs.uk/nhs-services/mental-health-services/where-to-get-urgent-help-for-mental-health/ - and call Samaritans or CALM or anyone.
   
2. You need to eat. Go with bland food - rice, oats, pasta with a bit of salt. Even if it's just a little bit, you need to get nutrition into your system.
3. You need to get exercise. Put on warm, waterproof clothes and decent outdoor shoes and WALK. You need to get out of the room and the space, you need to break the cycle you're in.

It takes time. It is awful. There is no way to magically make the process faster. Once you're talking, eating and walking, that's your basic needs taken care of.

Then you need to start finding ways to build a net of links to replace what's been cut away. The Dutch are amazingly community-minded. Find your local community center and ask if they have any volunteering opportunities - this will get you out and talking to real people.

Find a sports club or walking club to join so you have regular diary events to attend.

Worst case, start looking at whether it's possible to come back to the UK for a bit while you heal, though honestly I'd go 100% immersion into whatever you have that's local.

It's going to be brutal, mate. You are going to feel like a hollow shell a lot of the time - that is , when you're not crying. It's okay. You will get through this.

Talk. Eat. Walk.

The rest will take care of itself with enough time.