I had a tapeworm(s) once. I was part of a team developing a breed of corn tolerant to high altitudes, and our test area was in a mountainous region of southwest Brazil. I had been there for several months when I noticed I was losing weight. At first I chucked it up to being in a foreign country, but I began to grow weak and lose energy. I went from 190lbs to 155 in the course of maybe 10 weeks. At this time I had constant muscle cramps, my hair was falling out, and I was racked with anxiety that I had cancer. I was sent home and as soon as my doctor saw me he ordered a battery of tests and prescribed me about a half dozen pills. One of these was for the treatment of intestinal parasites. The morning after taking it I go to take a shit, and I shit out 3 feet of silky white worm. The fun part was the worm was much longer than 3 feet, so I had to pull the remaining 8 feet or so out by hand. I could feel it move inside me as I tugged, and it was as horrible as it sounds. There were also a bunch of little white ones that looked like mini spaghetti noodles. To this day I have no idea what I ate that caused all this.
tl;dr- Never go to Brazil.