Anyone had a difficult baby and then had an easy one?

My first child was a dream, slept well, ate everything etc.

My second, who is only 13 weeks, is very difficult. He won't eat, he are having to force feed him just to get the minimum into him, we are waiting on a referral to a feeding clinic. He's on allergy milk, reflux meds, milk thickener etc. He's been sick with several viruses and been in and out of hospital on IVs several times. He's had blood tests, ultrasounds, scans etc. He often crying inconsolably, especially when we try to feed him. He hates being held.

We've always dreamed of 4 children but I don't think I could do all this again. My heart is in bits trying to do the best for him while also ensuring my daughter doesn't feel like she's receiving less attention.

I keep looking at my dining table chairs and envisioning all the seats filled but I just don't think my heart could take this constant worry again.

Anyone else go through something similar and their next child was easier?