Indigestion & motions. Permanent heal.

I have been suffering from stomach pain,loose motions with gas & indigestion problems since a week post had tiffin(poori) Street side. I am sure that the oil they used for making poori was poisionous. First 2 days, motions were out of my control with no hunger feeling. For relief I used Gelusil chewing pills, ENO powder to get digest the food that left inside and 'Eldoper' capsules to get hinder the motions problem. Got relieved from motions with 'eldoper' capsules and all other medicines were not given me better results. However, the symptoms mentioned above are resurfacing even after a week. Kindly suggest the solution for permanent heal. Thanks in advance for update & suggestions. Regards, Rajesh