a few thoughts:
1) Ongoing congestion and digestive problems are not conducive to... well anything. So if milk is giving you problems, then don't drink it. Try yogurt, for example. And if that doesn't fly for you either, then forget it and just try to eat more other food. (the concept of not being able to eat enough is entirely foreign to me so can't help there)
2) Your work sounds relatively taxing. That could be outstripping your recovery capability. Fixing the congestion issue might get you back on track, but if not then try doing the "advanced novice" (light squats on wednesday) program and see if your progress is more consistent.