It is SO hard and draining these first few weeks. Someone told me the first 6 weeks are the toughest and after that things just seem to settle, in a lot of cases before this 6 week mark too but myself I found that to be the case, I'm 4 months in now and I could of wrote what you said myself just a few weeks ago. I kept getting poorly as I was so drained-like yourself being the sole feeder is hard as no one else can do a feed for you it's bloody tough and the constant wanting to be cuddled is hard going too I really feel your pain.
All I would say to you is make sure your eating plenty to keep your energy levels up and your milk supply strong, just admit defeat with the settling, she's so new all she knows is you and your smell, she wakes up in a dark strange place all she knows is you and wants you, it's draining I know but at the same time it's the most beautiful feeling in the world. Also the minute I gave in and admitted defeat it was easier, everything around me I thought it will just have to wait, the house will have to messy a little longer as long as baby is fed and happy then everything else can wait. Oh and visitors! Bloody visitors 🙈 I was very strong this time and seen hardly anyone I only had the grandparents mainly to be kind and that was limited as I just put us first that's a biggie, my uncle only met mine the other week it's not being selfish it's putting yourself and baby first.
Try to make the most of sitting around and watching crap tv, my go to was binge watching don't tell the bride, towie (from the very beginning!) 6 part dramas, if I couldn't get out to the shop one day I didn't feel bad or useless I just went with it and though oh we'll always another day.
This phase feels like forever when your in it but trust me your blink and she'll be so grown up, also I think the minute you relax and chill out then she will settle a lot better. I did notice that with my little one, the minute I just went with it she became so much easier.
Sorry for long post but I really do understand and was there myself very recently and if I'm only 4 months in and can tell you it gets easier then your not far off yourself. Be kind to yourself and to your little one, soak it all up and take care of yourself 🩷 eat whatever the hell you want watch whatever you want just try to spin it and enjoy it all while you got an excuse too before your running around a busy toddler 😆
Ps I found an online breastfeeding group which I found so helpful just reading other people's current experiences really helped me as I didn't feel alone.