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You're very high risk. High Risk means that you are in danger of serious harm or death. He could easily have killed you by placing his hands around your neck.
I have looked up the West Midlands and there are a few organisations you can email if you can't call and they can communicate with you via email or text or instant chat perhaps.
You could tel him that you have a doctor's appointment after work and use that time to contact various places.
I don't know where you are but email one of the following asap:
BIRMINGHAM AND SOLIHULL WOMEN'S AID
PhonePublic0808 800 0028Helpline - refuge referrals and access to community-based services: Mon-Fri 9.15am - 5.15pm
PhonePublic0121 685 8687Head office - all other enquiries: Mon-Fri 9am-5pm
WebsitePublicwww.bswaid.org
[email protected]
BLACK COUNTRY WOMEN’S AID (FORMERLY SANDWELL WOMEN'S AID)
0121 552 6448Helpline: 24hr
CHADD Outreach
PhonePublic01384 864232Outreach
[email protected]
WebsitePublicwww.chadd.org.uk
Coventry Haven
PhonePublic02476 444077All services: Mon-Fri 9am-4.30pm
[email protected]
GILGAL BIRMINGHAM
PhonePublic0121 7731431Refuge - 24 hours
PhonePublic08006783283Refuge/Helpline - 24 hours
[email protected]
WebsitePublicgilgalbham.org.uk
There are a load more if you put West Midlands into the Women's Aid search directory I posted earlier. Email them for advice and support OP.