Astro, I hear how worried you are about L. I would be tempted to take him to the Dr anyway, tears or no tears. I don't know much about choking but it seems possible that he could have had some soft-tissue damage from choking - even if it was mild, it might change the physical sensations (or whatever) so that he could have a real dysphagia (swallowing difficulty). Or it might be purely psychological - but you won't know unless you get it checked out.

He might need some physical therapy (speech therapist?), some short-term dietician help, plus the mental health support, so you might need a referral to a multi-disciplinary team. Keep a record of what he's eating for a few days (recording actual portion sizes) and maybe even start tracking his weight. That will help the dr to determine the urgency of the situation and might help you get some (public health) assistance sooner rather than later. .

When my DD wasn't eating due to a really nasty ulcerated mouth, my dietician friend stressed the importance of getting protein into her. A really basic way of doing this is by mixing skim milk powder into regular milk, and using that for milk drinks, added to soft foods (eg with mashed potato, scrambled egg, homemade custards, pumpkin soup, ie, whatever he will eat/drink). You can also get extra calories into someone who's not eating much by using oils and whole-fat dairy (milk, cream, cheese, butter) and adding that to food whenever you can (ie melted cheese in soup, cream in porridge, olive oil on veggies, etc). It's not a long term solution, but it might help between now and when you can get him seen by someone with some expertise in this area. But try to keep him eating whatever solid-ish foods he'll eat because it will be even harder if he stops altogether.

Hang in there and let us know how you get on.