IMHO, two wrongs do not make a right. you feel he has not been edifying towards you. but if you start a blog to complain about him, regardless whether he knows about it or not, doesn't it reflect that you are also not edifying? you will lose your moral high ground already.
moreover we live in such a connected world these days. who is to know if he might somehow one day get to know about your blog? would that help your marriage/relationship with hubby?
ultimately, i believe the couple needs to build a strong relationship. try to solve problems between the two of you. dont't run to your parents to seek refuge. dont't be swayed by your parents' comments because chances they will side with you. though it is well-intentioned, it might not be the best and most objective advice. besides. they won't know the man you married as well as you do; they won't know the problems as well as you do. most importantly, they won't be able to provide you with the solution because the solution lies within the husband and wife.
i also have an engineer husband while i am totally humanities-trained, so i have experienced the kind of insensitivity you mentioned above. in fact, earlier this year i also hurt my ankle and knee while carrying our son. it gave me nagging pain for weeks and i went to see traditional chinese medicine for a few times. my hubby didn't give me TLC in the way i had hoped he did, as he has a super-high pain threshold. but i know who i married, and i know this man is not unkind or unloving deep down inside. there are a few times when we have argued a bit at my mum's place but it is issue-focused (not personal attacks). we dont't lose control of ourselves, and i also make it a point not to make disparaging remarks about him to my parents and friends, whether in front or behind his back.
finally, dont't think of separation so easily or callously. you have a young toddler whom you both love, and who loves both of you and needs a complete family, ie father, mother and child.
i am a straight talking person and sometimes too long-winded. hope you dont't mind my comments above. =)