Hi @sis, welcome back!
Yes, there have been quite a few changes but I will be able to reunite you with your old account, don’t worry!
Some users had multiple email addresses in our system, for whatever reason, and there has been this annoying glitch where a new account has been created for each of those users.
Apologies, I know it’s frustrating, but in the meantime you can continue to post under this new username and all your new posts will be brought over to your old account when I merge them. I will wait until I have confirmation from our tech team that they have time to update your details, as it will involve you being locked out for a short time and I want to minimise that!
To create a poll, follow the steps in this post 
Please let me know if there’s anything else you need help with!