You are using sand wich can be a real hazzard. Your lizard could be inpacted with sand and the simptons of that are similar to the ones your descriving. Also dont use mealworms, at least not for now, use small gut loaded crickets and dark leafys vegetables. Get rid of the sand, use kitchen paper, give your lizard a shallow warm bath to help him rehidrate and to help him expell any thing that may be causing a blocage and try to hand feed your lizard with some shreded leafys and a copple of fresh killed small crickets (cruch heads or put in the frezer for a copple of minutes, that will do it) and ad a bit of suplements to every food item. To hand feed him try to put very gently some food beetween its lips, he should start eating imediatly