hi brownie, as you know ava's always been clingy, kenty gave me some good advice when I asked about it on here
could you maybe try leaving her for a few mins, then coming back, then going again and coming back, gradually over days/weeks extend the time so she realises that yes you will go, but you'll always come back.
It does work but take a lot of perserverence, I think by taking him everywhere with you will make him worse, it did with ava. I feel for you!