@Megs Welcome to ShootUp! That must be seriously terrifying to suddenly lose all your signs. Mine have changed over the years but thankfully they’re still there (touch wood, fingers crossed etc).
A CGM sounds like a great idea. I find mine tends to lag behind a bit when I’m low – if I’m dropping quickly it’ll say I’m a 4 but I’m really a 2 – but if I had no hypo warnings I’d just have my low alarm set to around 4.5 so it would kick in. And of course the trends will be really useful so you can see when you’re dropping. Are you getting one soon?