eat more protein.
if you can tolerate grains, that's good. If not eat s@#$-loads of veggies including tubers like sweet potatoes, etc. in addition to fruits, etc.
Mass Made Simple is a bulking program you might want to consider. If you can't afford it Dan has a MMS-lite program here -->
MMS and MMS-lite share a philosophy but the workouts are very different. The lack of complexes in MMS-lite make it lot easier for some -- especially 45+ yr old geezers like myself. That said, the complexes and high rep squats will leave you cursing and then smiling when you finally make it through the program.