I have had such bad gas, stomach paid, and diarrhea for almost 2 weeks. my stool is an odd brownish color that is much lighter than normal.

Many possibilities: This is probably caused by a microbe; based on your symptoms likely a parasite such as Giardia or Blatocystis hominis but some bacteria can cause this too. You could see a Dr. for stool testing but the lab often may not find them even if there. Papaya seeds work as well or better than drugs for most parasites- chew 2 tbsp once every 3-7 days for 3 doses. If not better after that see a Dr.