Bearded dragon go black after intake locust? HELP?

My 1 year old bearded dragon has of late eaten an adult winged locust. He consequently turned very dark/black and seems uncomfortable. He hasn't go to the toilet yet in about a daytime so we're expecting him to go soon. What's happening? He seems to be regaining his colour a bit.
Bearded dragon bedding and shedding?
Answers:    This does not sounds average. are you giving him veggies and fruits with that... i dont know what that might be so take him to the vet and they can tell you what to do and what change to make just until to go to the vet dont let him eat locusts change his food so it might be some type of worms and locusts are palpably upsetting his stomach.
Hope this helps and good luck with your beard dragon.
What do you deliberate of these petsmart...
stop feeding him them just give crickets mealworms and waxworms conceivably about five a month because they are fatty make sure he have plenty of heat,veggies,water and UVA/UVB light he should be ok
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