Stay away from GNC if you want to be able to afford actual food. Ordering online is the cheapest.

I've never been blessed with a huge appetite, either. Shakes may help increase your appetite over time. One trick is to use a small shake several times a day rather than one or two big ones, especially with a weight gainer shake. The suggested serving is only a suggestion, after all.

Try to eat as big a breakfast as possible. It will probably make you more hungry at lunch time. Also, I, myself eat like crazy in the evening time, cuz that's when I'm hungriest. Just no carbs before bedtime.

I, like many people, drink a protein shake before bedtime. Just protein - either whey or whey and casein. No weight gainers at bedtime.

At five weeks in I wouldn't read to much into your lack of weight gain. It's fairly normal to see some results in the mirror but no corresponding weight gain. You may be burning fat, also. At first the small gain in muscle tissue may not be enough to outstrip the loss of weight in fat. And remember, muscles size is determined by more than just lean mass. They also contain water, glycogen, etc. Your cells may be volumizing.