I came back after a few months because I couldn’t sign in. I did, somehow today and all my pets and sPs are gone! All my lovely pets.... I had over 5 mil sPs.
Can someone give me some advice?
ETA: I have a pet named after my UN but I never created this pet...
Never mind.

I suggest filing a ticket.
I'm only guessing, but it seems like someone hacked your account. What you experienced isn't normal.
If you don't login for over a year, people can claim your pet names - but your pets would remain on your account, and they would be renamed OLDPETNAME+bunch of numbers. Your sP and other items would all still be there.
Sorry that happened to you :(
[edit] Accounts are not cleared! They remain intact - only names are released. What's described here is a completely different issue.
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Thank you. Looks like I got hacked and my pets stolen. Sonally the ruffle has no numbers after her name :(