I EBF both my DDs for about 4 weeks. With DD1, it was to do with reflux and she was much more settled with 'easy digest' formula.
I felt guilty for not BF for longer; I think this is because I blamed myself for her reflux and felt that I should have persued BF for longer than I did. There were other issues - I'd had a difficult labour and sustained damage to my perineum and tailbone which made getting comfortable to feed was challenging. It was a relief to switch to formula, but I always felt a twinge of guilt.
DD2 was born in April this year and I had a wonderful ELCS. I EBF her for approximately the same period of time and the experience for her was different to DD1, in that she happily took my milk.
Different story for me, though. Perhaps because I'd had an easier birth experience, I noticed the impact that BF was having on my body. My boobs were huge - uncomfortably so. So big and heavy thatthey pulled me forward an I was kind of hunched over. My nipples we'd sore and cracked, eventhough her latch was good. The letdown reflex was painful for me for about 30 seconds every time. I had to distract DD1 when I was feeding DD2, which I didn't like. Nightdress were more tiring this time.
Anyway, I got a blocked milk duct sometime near te beginning of week 5 and DD wouldn't take milk from my breast because it was
hard. I had-expressed and used a pump but DD wouldn't take it.
I literally cried when pumping these pathetic quantities of milk that were causing me quite a lot of pain. DH just said 'let's give her a bit of formula', and I was so relieved. She took the formula sweet as a nut. Since FF her, I've enjoyed feeding. There's no less love in it; I take care and loving prepare her bottles. My DD1 can help, DH gets to feed her. It's lovely and it suits us.
Obviously, this has to be your decision. Your baby won't get antibodies passed through your breast milk if you EFF. That's the only difference, really. Your baby will, though, get nourishment either-way and because the molecular structure of formula is larger than human breast milk, babies yes to feel fuller and rest for 3-4 hours between feeds.
Maybe you could try mixed feeding while you see how you both get on? That way, you're not going to stop producing milk and can build up your supply again if you decide to continue BF.