Do not give in to that feeling.
A friend of mine five months ago disappeared after being discharged by the crisis team, she'd gone to hospital following a suicide attempt and been told, in front of her husband, she'd not tried hard enough to be genuine. She said she was popping to the toilet and did a runner. For two days people searched for her. She had money on her as well as a bus pass. She was seen at another hospital having got a taxi to another place and taken there and discharged then she was eventually found after a member of the public rang the police to express concerns after seeing her in a severely distressed state running (literally) up a mountain from a train - they didn't realise it was her as she'd cut her hair off.
I was up all night praying, there was very little hope from anyone given the circumstances but she was found. She's been in and out of supposed "secure" hospitals since which she has been able to leave and ran from - on one occaison the staff said she'd said she was fine so no reason to keep her in - she was on the highest level of section and they let her go, they got slammed for doing that by emergency services.
She's currently at home with her husband. I've seen her twice since, she's deeply ashamed of what happened and got trolled by people for wasting police time and money and other emergency services because of the appeals on tv and online and now has to deal with that as well.
My point is, services have cracks you can disappear into forever and never be seen again. It happens more than you or anyone realises.
I've spent more than one night praying vigils for her safety throughout the night in bed and on the floor.
Don't give into that feeling.
I know how hard what I'm asking is. I really do. But you don't give in and lose hope until you've hard evidence.
You won't be alone in praying, even if no one else sees this I will pray as long as I can for him being found and safe return and getting well. You are not alone.