I'm new here also, so I'm not sure if all the more established members are right... or if you're genuinely curious and anxious. If your curious and anxious, I'd suggest that you talk to your local sexual health providers about your concerns. They'd have a better idea about your personal medical situation, and can advise you better about risks; and hopefully be experts on it
I would say that you do seem a bit too anxious about it. Condoms for oral sex is a bit over the top, IMO. I'd refuse if a guy wanted to wear one to get blown. I don't want a mouthful of latex. But I understand the risks, and make my choices appropriately.