Thank you both for your comments. I guess I thought the back office of the website would still be under my WordPress login but that the url would be in use by shopify…my knowledge is limited but I didn’t expect my entire account to be wiped.
123-reg are my old hosting service so I will speak to them, I did have website back ups but I also find WordPress sites easy to use so will be able to reset up in an evening.
Thanks again!