They will help you, support you, listen to you. Mine was amazing, she saved me. On the second visit I was in bits, I had newborn twins and a 2 year old with a less than supportive (now ex) H. I was really struggling, babies had severe reflux, I was losing weight because I literally didn't have time to eat or drink between the 3 of them.
She dropped her bags on the floor, sat me down and picked the other baby up. She made me a cup of tea and a sandwich and sorted my toddler while I ate, I think she might have even washed some pots!!!! I think I just sat there dazed. She spent about 3 hours with me, we talked, she was genuinely lovely. She saw me weekly after that, I really needed it. She got me to go to my GP, I didn't want to but she explained what would happen and what I needed to say - totally nipped my fast emerging pnd in the bud, she even called the GP so I didn't have to repeat the whole thing.
Just small things, she told me to just give them a bottle. I knew this is what I wanted to do but was expecting her to push me to keep trying to bf, but she didn't. And we were all so much more better off for it. It was one of the best decisions I made in the early weeks and she totally supported me with it.
She saved me, and my kids, it was a really tough time, she was such a huge help.