Having trouble eating

I am now at the begning of 17 weeks and I am some serious problems with eating. At the begning it seemed like I was eating all day and couldnt get enough. now I have to sit down and make myself eat. Its a good day if I actually get three meals in, but most days I am only  getting one or 2 real meals in and  maybe a snack. Are they any suggestions or tricks to get more food in w/out feeling like im stretching out my pouch. I realy just afraide im not eating enough for my growing baby any tips will be helpfull. Also I was wondering if anyone else had trouble w/ stiff legs after sitting or standing for an hr or more if so what did u do to releave it. it seems my most comfortable position is to lie down but i do have to work and go to class.

I go through stages where I can eat so much food I am sure I have stretched out my pouch, then I have to struggle for a while to eat. It flips back and forth. I have decided to not worry about my pouch, and make the best choices possible at this time. I am a worrier, so I can create enough things to loose sleep over.
Not sure about the legs, but my most comfortable position is laying down as well.
Good Luck