I combination feed, DS is 4 weeks, i also had an emcs.
I started off ebf, but DS lost too much weight, mw suggested f top up to get his weight back up this was at 4 days old.
Once i started adding f DS refused breast as a bottle teat was easier for him, so i was expressing, this was the hardest part especially at night when OH was back at work, every 2 hours it was a routine of change, feed, settle which took upto an hour, then start setting up to express, expressing, washing out equipment then sterilising. Some nights i would only get 15 minutes of sleep each 2 hour session. You have to be prepared for this, it is hard work, what made a difference was lending the hospital industrial dual pump, it was quicker and boosted by supply by 10 ml.
But the thing that made the biggest difference was the feeding support midwife, who was amazing, she suggested nipple shields, and now DS feeds from me no expressing needed, i still combination feed as he's still hungry after feeding from me (for 8 out of the 10 daily feeds) but this saves so much time and crying, as soon as he starts rooting offer one breast when he starts coming off but still wants more do same with other breast, then whilst he is chilled sort out bottle and change nappy, offer the bottle if he takes it, the amount can vary i make a 60 ml (3 oz) sometimes he doesn't want any sometimes just 20 ml and the last feed before bed he always wants it all. yes it is a waste of formula, but i am hoping that by going through both breast I'm boosting my supply and eventually he'll be back on the breast, then i just have to work on getting rid of the nipple shield.