There are many things you have said without saying anything. First, you are a person with a loose character and morals and is having a some "fun" every now and then. That is why you are "accustomed" to getting yourself tested "every 6 months" for STD. Possibly, this time you went to the wrong place, are now worried and unable to sleep well. If you are "99% sure" why do you need to worry? Possibly, that remaining "1%" is the part that is not allowing you to sleep well. You should return home immediately where you can freely go about your immoral activities and be able to get yourself tested "every 6 months" or may be earlier to be sure that you have not contacted STD. In Doha, you may find it somewhat difficult for you to go about in your "extra-curricular activities" and fulfill your desires. You may soon find yourself in trouble.