Thank you for your question. Here I see your worry of acquiring STD symptoms and related diseases during insecure sex. AIDS (Acquire Immuno Deficiency Syndrome) is one of the most deadly sexually transmitted disease (STD) nowadays with no treatment so far. HIV virus gets transmitted from syringe infected from a person having AIDS. People sharing needles for drugs are prone to get HIV if the person among them is infected and the needle is contaminated with his blood. From a mother to her offspring from her infected blood during pregnancy. Un- protected sexual intercourse through infected semen or vaginal fluid, mouth (saliva) and rectum.
In your case, you are not sure whether your partner is infected with HIV or not which is a point to worry. I would recommend you to get yourself tested as soon as possible to overcome any confusion related with this problem. Nowadays, an oral test (OraQuick Rapid HIV Test) is being performed which requires saliva as the sample. This test gives result in very less time say about 20 minutes. This test is capable of detecting only Type-I HIV antibodies. This means you can later go on for the normal procedure test for HIV that takes a longer time to get results but the results are accurate and reliable. I hope this would release you from the mental torment which is going on in your mind. Make sure that that you always take a healthy diet and restrict the use of cigarette and alcohol, if any. Take care. Good Luck.