Answer:
Enlarged lymph nodes are a symptom of an underlying health problem. Lymph nodes usually only swell when there is extra activity going on with them or they are congested.
When lymph nodes swell, they can become tender to the touch but it is unusual that they alone can be the cause of abdominal pain. It seems that there is an underlying problem.
When an infection is present, lymph nodes swell due to lymphocytes (white blood cells) rushing into the nodes to help fight the infection.
The answer to your question in my opinion would be no. The cause of your abdominal pain may be linked with enlarged abdominal lymph nodes but they are not the cause of problem.
There may be an infection prsent, you may have had a poor diet and created a bacteria filled environment, your body may be fighting a more serious ailment.
The best course of action would be to eat a VERY healthy diet, one which promotes good health and cleansing, take a visit to your doctor to check for any underlying health problems (note that swollen lymph nodes are not the problem, they are a symptom) and in general take very good care of your body.
For some good advice you can check this site out www.lymphadvice.com or if you want a guide which will show you how to heal your lymph nodes and body there's a good guide which I found at http://www.lymphedemaadvice.com
I believe this guide will definitely help with your lymph node swelling and will give you a better understanding of your body.