I’ll say what the others have said - it will get better. My baby is ten weeks, so those initial stages are quite fresh in my mind (although I’ve only got one baby to contend with! I think you’re doing wonderfully!)
From a practical level regarding your fear of leaking: tell your DH to go to the shop and buy you some high absorbency Tena lady pants. I only discovered them with my third baby, and they’re a bit of a game changer in terms of peace of mind. I didn’t leak once, despite bleeding heavily. However, I didn’t have a c-section, so can’t be certain they’d be comfy on your scar, but certainly worth a try!
I think in those first weeks, when you’re bleeding, and constantly covered in sick, and your milk is leaking all over you, and you smell a bit funny (I did! 😂), your body feels completely alien. This sensation will pass.
With regards to the feeding, I would certainly seek specialist help from a breastfeeding professional. Unfortunately, midwives, health visitors and GPs often know very little on the subject, and give out incorrect advice. I’m not saying you’ve been told anything wrong, but it’s worth getting someone who really knows their stuff to come and see if there’s any way to make feeding easier.
I think it might be worth considering letting your DH read through this thread. I think it’s easy for the father to completely underestimate just how difficult it is to be a new mother. If he’s talking about “fairness” in terms of your respective mothers’ visits, then he obviously doesn’t quite grasp what you’re going through. Two weeks after twins arrive is not the time to raise such trivial but tricky matters. All that matters at the moment is that you receive the help you want and need. Whatever YOU want right now must take priority. Bollocks to fairness.
Best wishes to you, OP. It sounds as though you’re doing wonderfully well, even though you may not feel like it. And all the other PPs are right - you absolutely will feel so much better in time. Your babies are lucky to have you.