I'm currently in mumbai and am feelin shivery yet hot. A little stomach upset. Could it be malaria?

It is possible. Early signs/symptoms of malaria include fevers/chills on and off, fatigue, sweating, abdominal pain, headaches, diarrhea, aches/pains. As malaria progresses, high fever (eg 104) occurs every 2 to 3 days, also get jaundice (yellow skin) and confusion. It is a good idea to take medicine (eg. Mefloquin) to prevent malaria when visiting countries that have it, and to get seen asap for fevers.