Nausea, Lightheadedness And Weight Loss During Travel. Worried About Malaria Infection

I am currently visiting Africa and I am scared about my health. I was given immunizations (Typhoid, Yellow Fever, and Hep A - 1 week before I left for Kenya) and was put on Malaria pills because I was traveling to the Maasi Mara. My health was fine/normal for the first 2-3 days, then I started taking the pills (regimen: 2 days before, 3 days during, 7 days after the safari). I felt fine after I started the regime but after 2 days I started noticing my skin feeling "stingy", I started losing weight, and I began to feel nauseated and seriously lightheaded/dizzy after I ate. Now, after another 5 days, I am completely constipated and feel like my food will not go down past my rib cage(not digesting) and I am around 4-5 pounds lighter (1 clothes size). It has been over 7 days and I have not gone to the bathroom and I feel nauseous and light-headed for most of the day.

I am worried about my health as I am traveling alone and want to know that I am ok. Is the Malarone causing this problem. Should I go off the Rx for malaria or is that risky? Is this something unrelated to the pills?

I am currently drinking a ton of water and green tea, and eating watermelon and fiber cereal... for the last 3 days with no response.

I am typically in VERY good health.... not overweight, athletic, world-traveler, not on any prescriptive meds. In fact I have never had constipation for over 2 days, let alone 7+. I am currently a 34 yr old professional, that is 125 lbs and 5'9. I have two more weeks in Africa and want to know if I should continue my journey.

Thank you for any insight you are willing to provide..