Alan,
Firstly, I am very sorry to hear of your situation and, from my own experience, would reiterate all the postings encouraging you to seek help.
To put my own situation into context. My Wife was diagnosed with early onset dementia at age 58. I had retired early and became her carer. Initially, life went on largely as normal, but with adjustments. We also received support under the Young Dementia Team of the local NHS Trust. As things progressed, the diagnosis changed to Alzheimer's and then Advanced Alzheimer's. Having moved around the country with work, I had no relatives nearby and the pressure of being sole carer was enormous. Each day you take on just one more responsibility, and do not notice that incrementally you have taken on more and more. It's only when you stop that you become aware. This is the danger. I think this is were you may be.
My Wife deteriorated and was hospitalised for 20 weeks. At which time I was informed not to attempt to care for her at home anymore. I found a wonderful care home, the first Dementia care home in the UK to attain "outstanding" status. The best thing I did for both my Wife and myself. Sadly after looking after her at home for 9 years and then 3 1/2 years in the care home she passed away in July 2019. Sad but also a blessed relief.
During the time I was looking after my Wife at home I had linked up with Alzheimer's Society and a local charity. They provided great assistance and resources that we could join in with. In the later stages Social Services became involved and, although helpful, were clearly stretched and I had to fight to obtain the necessary assistance - be prepared to do this.
I live on West Yorkshire/ North Yorkshire border, so not too many miles from you. In fact the Dementia services are provided by the same NHS Trust (Tees, Esk & Wear Valley - TEWV NHS Trust).
There is usually a branch of Carer's UK locally - may have a different name. Your Doctor's surgery will have details. They will also be able to refer you to Social Services and maybe other charities in your area. Looking online you have one near you - Teeside dementia link services -
(www.tdls2016.org) - they maybe worth a call.
Please get in touch with your Doctor and start the ball rolling.
I wish you all the best in this difficult journey.
Ken