My son suffered with this problem since last month, his throat is tight and no food can pass through

I am so worried about my son he is very skinny now, from 180

to 160, i bought some baby food and he can't eat it, he can drink some ice cap

which had no nutritional value, yogurt is drying up his throat .

 No solid food can go through even soup is also very hard for him to swallow.

I am afraid that he would get very ill with out nutrition going into hid body.