Sorry you are having such a hard time.
Can you post on the infant feeding support section to get more specific help about your breastfeeding challenges?
I had a rough time at the start with my first but we made it to 12 months with my first and 16mo with my second. So I can only say hang in there. Obviously you can also stop if you need to.
I am not sure what to say about your DH. Can you have a chat and remind him that paternity leave is specifically to help him bond with the baby and allow you to recover?
Does he have much understanding of how breastfeeding works? Can you direct him to some websites - I always found Kelly Mom useful and I shared loads of links with my clueless co-parent.
Is there anyone else who could talk to him - might slightly shame him into being a bit more helpful.
You could talk to the HV?
What does he do with the baby at the moment? Is he on top of keeping you fed and watered, on top of chores while you are focusing on feeding?
Are you able to give specific tasks? I know you shouldn’t have to but perhaps if you could direct him
or put him in charge of certain jobs (all nappy changes / all cleaning of expressing equipment / all meals including kitchen clean up / all laundry etc).
Does he take the baby for a walk every now and then so you get a short break?
I am not really sure what to say because I would be so resentful in your shoes but it’s not really helpful to you if I just say that your husband has not really stepped up enough. The golfing would infuriate me.
Try to talk to him calmly when you are a bit less emotional and try to be as clear as you can about what you want him to do.