a whole 6 days!! thats nothing let him be for at least a month,also do not leave the crickets in his tank if he hasn't eaten them within a hour or less take them out and try again the next day at the same time, they(crickets) can stress him even more than he allready is if you leave them in to crawl all over him.. his temps sound ok although his basking spot could be a little hotter about 130-135 cool side anywhere from 75to 80 dirt is the best substrait as deep as you can for burrowing,and nice tight hides in hot warm and cool places.
but for now just leave him alone try feeding once a day at same time and any uneaten food remove after a hour and try again the next day ,also try a pinky live to mabye get his attention if he dont eat remove it try the next day i sure you get the piont also make sure he has plenty of fresh water.
if none of this works ask frank... lol
but really if it dont ask him, also let us know how he progresses
best of luck with your little sav