Stomach pain after eating

My question is; have you been out of the country ? you may be fighting some tropical decease and doctors here do not know how to diagnose and cannot find anything nor even with cultures or blood work as you have to catch these little critters when they are active in a very small window of time. I had a similar situation with one of my children. After being in south America for a month, we came back and he had constant stomach pain to the point of throwing up I had him at Sick Kids in Toronto,for almost a month and after all kinds of test, and cultures they did, the doctors could not find anything wrong with him, yet he was loosing up to 10 lbs a week!!! and was in terrible pain, as a parent I was frustrated and angry and since my kids doctor was on holidays I could not seek his medical attention, lucky for me I knew when he was coming back, and I called him and told him my situation with my son and he asked me to check him out of Sick Kids and he would meet me at his office immediately. What my son had was tropical stomach parasites and Dr. Tolkin explained to me that they can only catch them in a precise moment as it is very difficult to catch even with cultures or blood work. He himself call the pharmacy and prescribed the medication, two table spoons immediately and one table spoon for the next tree days. Within a day my child was much better and within a couple of days he was back to normal and gaining weight. At Sick Kids hospital even with all their up today equipment and experts, they could NOT help my son, and I could not bear to see him in so much pain and loosing so much weight so fast, I was glad my pediatrician was excellent and knew exactly what it was. The First question he had for me when I phoned to let him know that I had my son in the hospital and they did not know what was wrong with him, was WERE YOU OUT OF THE COUNTRY? He knew it had to be tropical parasites!.