It is possible Barry is anemic from fleas.If so, he will have pale, whitish gums.
Or he could be hypoglycemic or dehydrated.
Rub a drop of pancake syrup or honey into his gums too raise his blood sugar.
Drain the water from a can of tuna into a bowl and see if he will lap it up for hydration.
To get rid of fleas quickly without insecticide use Avon skin so soft ..
I can give you coupons for a free vet visit:
here are two Vets that offer a free first visit:
The ASPCA has low cost vet care. You can also try www.carecredit.com for financing.
Please let me know how Barry is doing.
Reply here or if you prefer we can speak on the phone.
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