help, my beardie has no interest in food all of the sudden

[grammytracey]

Thor is about 1 year old, has always eaten crickets, supper-worms and Dubai roaches with no problem...never liked any veggie's. But all of the sudden he just lost all interest in any food. The vet says he does not have parasites that she could see. He did not eat for over 2 weeks before vet visit. I was buying roaches from a pet store that lost the whole colony of roaches so I thought he may be sick due to the "bad" roaches. I am now force feeding him just to get food in. He wont even open his mouth or try to eat. I bath him everyday because he is dehydrated and in an anorexic state (per the vet). I have no idea what to do. Any help would be great!

 

[grammytracey]

the bulbs are new, the old ones were about 5 months old, 75w heat bulbs and uvb is a coil bulb on top of the tank. We use a temperature gun (not sure what it is called) temps are around 100-110 for basking.
I did replace the bulbs when he stopped eating, however nothing else had changed, he has been in the same tank since we got him with no problems in 5 months, then all of the sudden he just has no interest and does not even try to eat on his own. The vet did test his poo and said she did not see any parasites or eggs. He has never been in brumation. The tank is large and he never went on the side w/o lights so I added another set of bulbs and he now goes to both sides of the tank. He is active as well, just wont eat anything.