Strange. Have you taken a fecal sample in for testing. I would recommend taking the animal in, but if $$ is tight, then a fecal test would be cheaper. What brand is your
UVB light? The red light isn't good for beardies. Beardies can, in fact, see the light they produce and it interrupts their sleep. Their temps can safely drop into the 60's at night, so the extra heat may not be necessary. You can use a larger bulb to attain the proper temps, or use two white lights. Either way, that is probably not why he is refusing food...
At this point, yes, you will need to force feed him. I have a syringe without the needle that I use to give Blaze meds. I pull her bottom lip down around the back of her mouth and poke it in there and then move it up towards the front. This usually causes her to open her mouth on her own. This is the most gentle way I have found and she still gets pretty angry at me.
Have you used a product called jump start? It is supposed to be an appetite stimulant. Also, there is a 'recipe' around here somewhere that people use to rehab dragons. It has chicken/turkey baby food, jump start, calcium and some other stuff. I will see if I can find it.
