Re: Questions about pregnancy and myself.
Toxemia is a pregnancy complication involving very high blood pressure. Sometimes it's mild. Sometimes, however, it's bad, and sometimes the only thing the doctor can do is deliver the baby early. That's probably what happened to you. (In fact, born that small, at least one or two decades ago, you're lucky to be alive at all. Congratulations, you're a real survivor.)
Might you also develop toxemia if you became pregnant? Maybe, maybe not. It happens to about 7 pregnant women out of 1,000. A family history of it does raise your risk slightly, however, there are things you can do to minimize it. Being at a healthy weight before you get pregnant is important, as is eating healthy during the pregnancy. If your blood pressure does start to become an issue, your doctor can pick up on the early warning signs, and help you carry the baby as long as possible. Sometimes blood pressure medications help, sometimes bed rest is required.
I do not think that you being born prematurely increases your risk for any other pregnancy related problems.
I wouldn't worry about the pain. If you lived through weeks in a neonatal intensive care unit, you can probably get through a few hours of labor. Besides, they have these nifty epidurals these days that block out most of the pain.