Apple Watch activity data missing

Hi, I went into Apple store today, as iPhone wasn't vibrating for messages if lock screen was on.

they "reset all settings" saying I wouldn't lose data. it fixed the message / vibrating issue, but now my Apple Watch 5 has lost all activity / fitness data... any thoughts on how to get it back?

I have rebooted both watch and phone... watch went back to this morning before I visited apple, but with only today's data showing... phone has no watch data, but does have watch faces, apps, layouts etc as before.

when I go to health, then devices, it shows 2 apple watches, yet I have only one.

1 shows as "This device is no longer paired.." - it only has data from today

the other shows no data at all.

not sure what the best thing to do is, and how I back up going forward.

thank you.