MrsTickle I know how you feel. I felt the same way. So I decided to go back to work when my son was 15 mths old. I regretted it. Spent the first week crying so much because I'd gone back too soon. I opted to do 7 days a fortnight. Had I of known I could've cancelled my return to work and delayed it I would have. I wasn't ready to emotionally let go. My son seemed fine and didn't seem like he missed me. So I cried every night for the first week. A fee weeks later I dropped down to 2 days a week. I felt guilty everyday I went to work. Then after 1 year back at work I decided to quit. fast Forward 9 Months later and I ended Up back at work cause my husband became a full time student. I know work casually and can choose to work if I want to and if I don't want to then I don't. I still feel guilty leaving him even though he's with my mother in law. But feeling guilty is my issue not anyone else's. My point is don't rush into it. I did. I thought going back to work would solve my problems of loneliness and getting out of the rut of everyday housework etc. I longed to work and stop being a sham. ......but it didn't pan out that way. I should have eased into it instead of going back 7 days a fortnight. I now realize that I'm only suited to part time work. So if it's something u want to do then please ease into it so you can gradually adjust. You have 3 kids so you'll be busy when you get home regardless of how many days you work.
Hope you can speak to your husband about how you feel and work something out.