Whoa, cool your jets their, turbo. As Teak has already pointed out, you have no way of knowing right now if the women you slept with even had HIV. Top it off with the fact that even if they were (which, I must point out, is not likely) the odds are still pretty much in your favor that you didn't contract HIV from them.
First thing you need to do is settle down. The second thing you need to do is to take a little time, sit down with yourself, and try to clear out your head. I feel the need to point this out to you: you are discussing suicide based on the very unlikely notion that you *may* have contracted HIV from one of the two women in question. This seems rather extreme, and unwarranted and yes, even a teeny bit irrational.
If you are really thinking about suicide, you need to address this ASAP. Call a telephone counseling service, or visit with your doctor, but this isn't anything to fool around with. You may also wish to speak to a trained therapist about how you are feeling. And when I say may, I mean, you should do so as soon as possible.
I don't even want to hear it. You don't even know if you are positive or not. You don't know if the people you had sex with are positive. You need to seek the help of a mental health professional or crisis center ASAP. You won