It is possible that DNP amplified the symptoms of a comnon illness such as stomach flu or food poisoning. However, DNP's side effects are far reaching and the side effects you have experienced does not necessarily imply that you didn't cylce the drug properly. Rather, it is likely to mean that you are one of many that have very unfortunate reactions to the drug. It is for the side effects that you have described that the drug should not be taken lightly-- especially by first time users and regardless of history with other drugs.
The link below has probably been posted before; nonetheless, it is a very thorough summation of much of the scientific research ever conducted on DNP and its closely related sodium salt.
http://66.102.7.104/search?q=cache:E...ient=firefox-a