To be honest 185g does sound on the small side if you're certain he's 8 months old, so I understand why you're worried. I would be too. The good news is that snakes will almost never starve themselves to death - if they've eaten before they won't forget how to eat. If you're worried about his spine, do you have any pictures? It might be easier to judge the urgency of the situation for the folks here with lots of experiences with tricky eaters and those who go on these long fasts.
Hatchlings might never thrive but I'd expect an eight month old snake without any underlying problems to be able to continue eating. Remember that their metabolisms are super slow - a few days at this point without any contact or attempts at all will be a benefit for him stress wise.
Good luck with everything.
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