I hope he can pass this stuff through his system .
Please , if he hasn't improved in two to three weeks get him to a good herp vet as a matter of urgency at least to have some xrays taken to work out the extent of the impaction and how he can be saved. Personally knowing he's been on calci-sand, I wouldn't wait that long, as it will only set harder.
Please keep him warm (24/7) this will help boost his metabolism and immune system , say warmer than 26oC overnight.
Bare in mind that the vet may decide an enema in required , this comes with significant risks, as does trying to force the blockage through by pumping the stomach and intestines full of water under pressure , this may be called for if the impaction is very stubborn.
I've a friend who works as a vet nurse ( she's a colleague of the lady I bought Rex and Puff as hatchlings, she breeds beardies and small monitors as a "hobby" ) , I asked her what can be done, and she said sometimes the vet uses focused pulses of ultrahigh frequency sonics to breakup these kinds of impactions and sometimes this helps.
There should be all the needed information printed on the uv tube or compact globe , just a matter of turning it off and removing it temporarily to look.
Best of luck, we're all pulling for him.