I am totally and completely pro life. I feel that what you choose to do with your body is for you to decide and no one else. I am in the 'mother should be allowed to terminate right up to term' camp.
But...I feel that the issue here runs much more deeply than whether or not you get HG.
To me it sounds like you were severely traumatised by the fact that pg put you in a position where you were vulnerable, needed help from other people and could not fend completely by yourself.
I felt very much the same way initially in my pg, although I did not have hg ('merely' horrendous ms, then pgp and spd). It was a huge wake-up call to the reality that human females when they have young are among the most vulnerable beings in the animal kingdom. Human childbearing is unbelievably taxing on the mother, and raising a child, particularly if they are sick in the early days, is very, very difficult without support.
If you are the kind of person who is used to being the one who helps, rather than the one who is helped, it can throw into question your whole personal identity.
The problem is that there are so many aspects of childbearing that can leave you in that state, even if you don't get hg. You may get really bad spd in late pg, when it's too late to have an abortion. Or you may develop a very high risk of early labour and have to spend large amounts of time in bedrest hoping that the baby stays in for just that bit longer to reduce the chance of severe damage. Or you may have a very, very premature baby that requires serious medical intervention and months of sitting in ICU hoping that they pull through. Or you may have a disabled child that requires large amounts of care day and night for years on end.
Unfortunately, the decision of whether or not to ttc has to include consideration of the effects of any of those possibilities. For me, the decision not to ttc no.3 was made when I realised that I would seriously consider terminating for abnormalities, even if they were compatible with life. The reason is that I did not feel that I could conceive a baby on a conditional basis. Otherwise, what would my attitude be if they developed something once they were born?
Sorry, I have written an essay 
. Could carry on, but will shut up and go away now. Just wanted to finish up by saying how much I respect that you are going through this thought process now, and really trying to examine your feelings rather than mindlessly blundering into something that could have severe repercussions on you and your family. And how calm and balanced you have remained despite some of the stuff spewed on here.