I have recently gone back to work after 5 years as a SAHM.
We have 6 kids aged 12,11,8,6,4 and 2.
I have had to go back to work at this point for financial reasons.
I do quite like my job, and I am lucky it is a good professional job, which I was lucky to get back into, and the pay is decent.
BUT I am just constantly eaten up by guilt 
DS2 (2yrold) hates nursery and sobs every morning when I drop him off.I have just decided to make some changes to my hours to do 3 full days (was working same number of hours over 4 days before) so I can have 2 full days off, and have hired a Nanny, which DS2 will hopefully prefer and will hugely make life easier for me....
BUT now I am beside myself with guilt that my older kids will be collected from school by the Nanny and not me 3 days a week. I am sitting here sobbing just thinking about it.
I know I am being totally irrational, but I cant seem to help it.
So does the guilt ever go away??? When I wasn't working I felt guilty I couldn't afford certain things for the DC...now I'm guilty when I cant be there for them....
Am so fed up with it all 
DH doesn't understand at all. All the decisions about childcare etc have been just a simple matter of figures and practicalities for him. I am so envious of him sometimes, that he doesnt feel like this. He just gets up and goes out to work, and thats it.No Guilt. No worry over who needs what for that day. No worrying about dropping a sobbing DS off at nursery. No worrying that one of the kids will be ill and school will ring to come and get them...
And no worrying that he isn't being the best parent he can be to them. Thats just apparently something for mothers to worry about. ALL THE TIME.