So far I've avoided posting here because I just didn't know what to say, but something about your posts don't sit well with me.
I totally get that you feel the way you feel, yet a couple of your comments have made me go 'hmmmmm'. Namely when you wrote about a mum-son relationship not being healthy and when you imply that the logistics of living with a boy would be awkward (trips to the bathroom etc) and that it would be looked at weirdly if you took your son on holiday. From what I've read from your comments, it seems that you have an ingrained issue with men/boys but have no desire to deal with that issue. I wonder whether there's been an anusive situation in the past which has made you feel uncomfortable around boys/men? (Other than the previous bullying)
As for your implication that a mum/son relationship wouldn't be as close or appropriate compared to a mum/daughter one, I'm utterly confused. Most mums of boys that I know have very strong bonds without their sons, the same as mum's nephew daughters do with their daughters.
Forgive me if I'm getting the wrong end of the stick, but it comes across that you feel the need for a daughter to fill a relationship void or perhaps to address something deeper, which imo is not responsible parenting and wouldn't be healthy for the child.
With regards to ivf for sex selection, I have very little knowledge about it however, I do know that IVF is VERY invasive, difficult physically, emotionally and mentally as well as being a costly gamble with really quite shitty odds. So if you do go ahead, please do so with eyes wide open, knowing that it'll be hard going, especially going it alone and also that the chances of success are slim to none.