Dragons need to types of lighting and a Supplements of calcium 5 days a week and 2 days a week they need a Vitamin. The UVB light is a must. It works with the calcium to metabolize into Vitamin D3 in the body to prevent Metabolic Bone Disease. To understand this problem, it is like scurvy, where the bones weaken and can break or they can get jaw problems, growth problems organ issues and even a problem with the spine. That is why it is important to see the picture of the spine. This is some information on MBD: http://exoticpets.about.com/cs/reptilesgeneral/a/metabolicbd.htm Unfortunately your Pet shop did not sell you a complete set up. The red light bulb is only used if cold. We Use the UVB light in conjunction with the basking light 12-14 hours a day. The UVB also has bearing on the activity level of the Dragon.
The Diet also need improvement. We do not feed meal worms or soft food. WE feed 20% Veggies at this age and 80% live prey to include Crickets, Silk worms, Phoenix worms, and dubia roaches. The veggies should include escarole, collard greens, mustard greens, dandelion greens, butternut squash, and you can give a little bit of berries for a treat. This is a Diet. Follow the green foods: http://www.beautifuldragons.com/Nutrition.html The reason we do not feed meal worms is the amount of fat and chiting in meal worms.
You did not say the type of substrate you have, but I suggest a solid one, since loose substrates can cause an impaction in the intestinal tract. You can use cage carpet, paper or towels. As far as the UVB I sugest a reptisun 10.0 linear tube.
If you can post the picture for me to see I can get a Better idea of what is going on with the spine. I can also locate a Herp vet for you with a State. I want to add temps are very important. The basking spot should be 105-110*F, warm side in 90's and cool side in 80's. I suggest a digital thermometer to check accurate temps.