I'll be honest, after 20 years, I had forgotten I was a lone parent until I remembered this forum!!
The hardest bits were (in no particular order)
Having to drive my oldest to hospital with the strange variation of croup that can be fatal, with my other child hysterical about being driven at speed through the night. Younger child and me had to try and sleep curled up at the end of my oldest son's bed.
Trying to keep in contact with oldest when youngest was in resus with sepsis, knowing the oldest wasn't really old enough to stay at home by himself at such an awful time. (He was 15).
I could have had surgery to sort out a badly healed break in my arm but there has literally never been anyone to step in and look after them/do the housework. So I have had a fused elbow for 28 years.
Being taken to court 1000 times by my ex, who ended up with little then nothing because he is abusive/got a criminal record now.
Never having enough money.
Having to take both children to parent evenings with me. One has SEND so they have been at different schools so one child would always be in unfamiliar surroundings and they both had to try and behave OR as they got older, the teacher would talk to me and the relevant child and the other would pull faces and say "Oh dear...." if the other hadn't done well !!
Always having to sodding drive everywhere.