This is somethin I've once struggled with, to the extent that the mere sight of food would make me cry. Can't say for eveyone, but I had to "force" myself to eat even though I was in tears the whole way through and it would take me hours to finish a little amount.
The more you go without food, the harder it becomes to eat.
If nothing helps, if theres no increase, visit the doctors. Either there's an underlying condition or its an ED, both for whoch hopefully help is available.