I have DS1 (4.1), DS2 (2.2) and DS3 (11 weeks old). I had a CS so the first few weeks were tough at times but I am lucky to have a lot of family near by who helped at tea/bath/bed time as DH is a farmer and usually doesn't get home until 6.30-7pm.
THe last few weeks have steadily become easier. I am more physically able to do things and baby is much more predictable with his feeding. He is a very efficient feeder which helps - 15minutes every 2-3 hours and he's done which is brilliant when I compare it to the hour DS1 used to take each time.
I have all three at home for two days a week. the older two go to a private nursery for one day and to the local pre-school (so term time only which can be a pain) for two days (DS1) / two mornings (DS2). On our days together we go the local toddler group one morning and meet friends in the afternoon. The other day we do different things each week. I always get out of the house with them at least once, even if it's only for my own sanity!
What I find hardest on a day to day basis is the fact the all three of them are reliant on me dressing them so it takes quite a while to get out anywhere. DS1 can do his bottom half but I look forward to the day when I can give them their clothes and let them dress themselves! It is also much harder to pop anywhere, for example the local garage to get milk, I tend to ask DH to do stuff like that or I go when the older two are at pre-school/nursery.
I would highly recommend getting a cleaner if you can afford one. Mine started two months ago and she does 3 hours every other week (so she comes twice a month). It has made such a difference not having to do much basic cleaning but simply getting on with all the other day to day stuff like cooking, washing, ironing etc.
Good luck, once you are feeling physically better you will hopefully find yourself less worried.