Hi John: Sounds like rapid-onset Type 1 diabetes, IMO. Here is a link to a discussion I started about rapid-onset Type 1. There are a lot of replies, but hopefully some of it is useful to you. Also, I wrote my top ten tips for the newly diagnosed adult with Type 1 diabetes that you might find helpful.
Sorry to welcome you to the club, but good that you have found TuDiabetes where you can get support and ask lots of questions! I am really glad that you already have a pump and CGM--that is awesome! You may not yet have a definitive diagnosis, but you are getting appropriate treatment.