I'm so sorry for your losses, that you are so sick, that you miss your son so much.
Like Sarah says, be sure to be hydrated when making any decision. And I encourage you to try everything you can before hand...anti depressants may help (Prozac actually helped my depression and to control the HG in my last pg), steroids.
You sound very much like you want another child, so I say don't give up hope until all hope is gone. Termination is an option many face and some cannot avoid, and we understand that here and do not judge. But having co-moderated the the grief board for 2 + years, I can say that I've learned the longing for a lost child is no different between m/c and termination, but I have often seen a lot of other types of pain in post termination moms that doesn't follow moms with fetal demises for other reasons. Not that any kind of loss is harder or easier but that they are different.
With your son, it will be tough on you and him, I won't lie. But he won't remember. I know this because I have an 8 yo with a GIANT memory, and he doesn't remember my HG in 2004...he doesn't...I recently asked leading questions and he does not recall me being sick at all, not even all the tears when Hope died. He just doesn't remember. So I say with some confidence that your sweet son will not remember...but that doesn't help much now, does it. I'm so sorry.
Please PM me if I can do anything. I'll listen, share what I know, and listen some more. I never ever want to see another woman have to grieve another child, but if that should happen for you or anyone else, I am there to sit in the pit with you.
Love,
Suzanne