Toobusytofunction - I was in your position 4 years ago. Worked full time in a very repsonsible job and split up with my ex-h. I had to cut back and budget to make sure I could manage, but life was so much better on my own with my DS.
I didn't have to deal with the stress of being in a relationship that was making me very unhappy and resentful and I didn't have to deal with looking after 2 children - ex-h was and still is very irresponsible.
I love being on my own and don't find being a single parent difficult or stressful. Its actually easier.
You just need to be very organised - this makes life easier. Simple things like, get everything ready the night before for the next day, spend some time when your child is in bed (once a week) to look at the week ahead and plan what you need to do. Choose particular days to do things i.e. washing Friday night, iron school uniform Sunday night.
I have some lovely friends and we meet up every fortnight with all the kids and do stuff like going to the park, out for lunch etc. When DS is at his Dad's every fortnight (over-night), I catch up with cleaning or sleep or treat myself to a trip to the hairdressers. I don't have much family support as my Mum suffers from mental health issues and my poor step-dad spends half his time looking after my Mum and/my Nephew.
I found that once I was on my own, I was even more career focused and worked even harder to better myself. I have had promotion since we split up, so money is not an issue now. Good job really as ex-h is out of work and hasn't given me any maintenance for 12 months.
I don't stress about being a single parent. I think if you stress about it too much then it becomes really stressful. The key is being organised.
I love being on my own with DS and wouldn't have it any other way - such a lovely, easy life.