Chlamydia is nothing to worry about, easily treatable.
You should be worrying about hep a, b and c (!), which you can get from giving oral. A&B shouldn't be a problem as there's a vaccine, but read up about hep c, you don't want to catch that shit.
Also, HPV, capable of literally fucking your mouth by developing into a throat/mouth cancer. Sometimes no symptoms, sometimes warts, no cure apart from some strains clearing on their own in time (something like 1-2+ years).
HIV is allegedly impossible to catch from cunnilingus, so wouldn't worry about that. But ofc it's up to you, if eating high risk demographic pussy in a not so well developed country sounds like a great idea to you, then, well, keep doing your thing and godspeed.