you were right!
The natural bug spray is crap. I should have bought the most toxic thing possible. I have tons of bug bites on my legs and one on my right hand, AND I forgot to bring anti-itch cream with me. I am going back to Sao Paulo tonight to spend the night with my cousins, and will ask them how to say "anti-itch cream" in Portuguese.
Otherwise, I am having a fabulous time. Must go pack and check out of hotel.