With being ill,if your ill you do just manage to muddle through.
I was really ill one time when all 4DC were really young,1,2,5 and 7 youngest DD was still breastfeeding,DS 2 is autistic and DS 7 was asthmatic when younger.
I dosed myself up,cuddled up on the sofa with them all and they watched movies most of the day.I made some simple snacks and a jug of squash and bought that into the frontroom and then at dinner time I made them scrambled eggs on toast.They all lived and they actually enjoyed the day of cuddling Mummy and watching tv.
You said about not getting paid,you must get paid sick leave surely?if your child's ill and your a lone parent you can take compassionate leave www.gov.uk/time-off-for-dependants/your-rights.
As a previous poster said if you had to go into hospital there are people that can offer support,not only Social services there are charity's that can help out as well.
Speak to your midwife and explain your situation to her she should be able to find out about any help or support there is in your area.
With your job would you ever be able to work from home if you needed to?
Before the baby comes make sure you get everything in place that you need.
In my last month I batch cooked loads of meals and stuck them in the freezer so I didn't have to worry about finding 30-60 mins every evening to make a meal.
I also had my food shopping delivered till I was ready to go shopping with the 4DC.