Kenyan Sand Boa Need Help !!!!!

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ivehad my kenyan sand boa for a month for the past 3 weeks a caretaker to care of it , he/she is not even a year old i think and is small. he/she live in a 10 gallon and with about 3 or 4 inches of sand . it has a heat pad on one side....... ok heres the problem my caretaker feed it on a tuesday and then the next night (wednesday) it regrugitatd it the next week it did the same im feeding it again tonight but for the first month i had it it ate fine and for the first time he feed it it ate fine but im back and i hope it get better.. the temp is at 73 f and im sure its hotter under the sand the pet store i got it from told my caretaker to check it every day to check it everyday for discoloration which i found today, the black is turning into a darker grey color.... please help my kenyan sand boa