I know it's stressful for you. But I'm sure you're more worried than he is.
I recently went through something similar with my sank. She used to ALWAYS and I MEAN ALWAYS take it from me on the tongs.
Now she's changed just like other animals, she's decided she wants it differently. Now I have to place it down in the feeding container with her and cover her up. And leave her for at least an hour.
If you start getting desperate just as long as you're waiting between scheduled feedings (Ie if he eats every 7 days only try every 7 days)and not trying too often, try leaving him in his container overnight.
As long as everything is stable with his environment and he's not losing weight you're fine, just breath