I'm a single Mum on benefits atm. I felt guilty about claiming benefits until the lady at JC+ said that benefits were meant for people 'like me' who had paid in and now needed time to raise children.
I worked as a single parent for 8 years with my Ds though and was lucky enough that my parents took on my son whilst I worked for very little cost or I couldn't have done it. I have never had any kind of support from Ds's father; he took off when I was pg.
When I had Dd 8+ years later (pg was a bit of a surprise), I only got a small amount of financial support from her father and I took a career break in order to take care of my Dc's. My Dad had serious health issues towards the end of my pg with Dd, so was unable to look after Ds.
I was hoping to continue the break until my Ds turned 14 so that I could have him take some responsibility for Dd before and after school as my hours are unsocial (I would be leaving home at 6am and often not home until 22:30 hours).
Sadly, the government have changed the rules so that once your youngest child turns 5 you have to go to JSA and sign on fortnightly, look for work and prove it. I'm not sure how I can do this legally as I'm already employed, but not salaried, so 'job seeking' is not what I need to do as I would be returning to my job a year after Dd turns 5.
The problems that I and I expect many many others are facing is the costs of childcare. When I return to work, I'll probably get quite a lot of help through WTC with the childcare element, but after the end of that first financial year, I'll get hardly any help and the following year even less help, so I'll be going to work to pay a CM or BC & ASC (assuming that I can rely on my Ds to help out) and that's assuming that I can find an out of normal hours CM that will service Dd's school...I've had no luck so far.
If I rented my home, I'd get much more help and could possibly consider going pt or changing my job to suit school hours...I can't resign from my job as I'd me making myself unemployed and would lose all benefits from what I gather.
Yes there is a stigma attached to being a SAH single Mum, but I haven't really had that attitude pointed directly at me, but my Ds has!! from a boy at his school who presumably had been listening to his closed minded childminder mother! 
Sorry for the life story. I'm suffering great stress from all the worry of my uncertain future right now.
If anyone has any ideas or advice, I'm all ears.