Secondary infertility hurts too. =(

I have read many of the posts, and can relate. My husband and I have been TTC#2 for 2 years...or better yet, 24 months. Therefore I have dealt with about 24 negative preg test and the realization that again, month after month I am not pregnant. I was fortunate to have conceived once (my son will be 3 tomorrow), although the pregnancy was rough and I almost miscarried at 8 weeks. And as hard as those 9 months were, I wouldnt trade it for the world and look forward to it again. I have had a normal HSG, I have had genetic testing to be sure that is not part of the problem. I am a 'borderline diabetic' and have had adrenal gland/pituitary gland testing, all normal. So the doctors really arent sure why I can not conceive #2. I have lost 20lbs and am trying to lose more. I am on Glumetza for ovulation, and my fertility monitor says I am ovulating.
My biggest frustration is people's questions or comments like..."when are you guys gonna have another" or "you arent pregnant yet?!" or "just stop trying and it will happen"...GRRR! Some people just should not be allowed to speak. And then doesnt my sister, who already has 2 and can't even afford them, gets preg and since gave birth to her third!! So needless to say, I dont want to hold anyones 2 week old, or one year old for that matter, and no, I dont want to attend their baby shower either. My husband says it isnt good to be so angry, but i dont view it as being angry, I just dont want to be asked those stupid questions or end up saying something I will regret.

Anyone else dealing with secondary infertility?????

-BTW- I am also sick of people telling me that I should be thankful for the one I DO have. I am EXTREMELY grateful for the one I have, but like any woman who wants a baby, it is a part of you that is missing, not complete, I cant explain it any better than that....it is like a biological drive thing, my family is not complete until #2. =(