Stomach Problems (cramping / pain / discomfort)

I've had this problem for about 5 years now and it's really bothering me. 

I can't be more than 3 hours late for any meal.  If I am 3 hours late, I feel fine, but as soon as I start eating after missing a meal for 3 hours or more, I start getting intense cramping/pain/discomfort in my mid-lower abdominal area.  This pain only starts after I start eating again.  I find that lying down in some positions worsens it very greatly and lying down in some positions alleviates almost all of the pain.  After eating and experiencing the pain, the symptoms subside within 60-120 minutes.  I have been told by my doctor to take anti-acids but are my symptoms really classic of acid reflux?  I think it might be something else.