it will get easier. I promise.
When I was at the stage you are now I just cried because the feeding was relentless and I felt like I just couldn't do it. There's a growth spurt around 2.5-3 weeks that just knocked me for six. DD fed for hours and hours and I really felt like there was no end in sight.
She's 6 months now and we're still bfing, so we got through it, but I don't know how!
Is your DP making sure you have everything you need? Snacks, drinks, meals? Once he goes back to work get him to make you a packed lunch before he goes out. I found food was a difficult one to sort out.
Do you have a sling/wrap? Can be a godsend in giving you your hands back and some you can even feed in (though I never got the hang of it).
Re bottles/expressing - the guidance is 6 weeks but we did it sooner just because I needed to for my own mental health. We didn't introduce a regular bottle, but I expressed and DH gave an adhoc bottle so I could sleep. I felt like I didn't want to sleep between feeds normally because just waking up to feed felt worse than not sleeping iyswim. There were odd times I felt she was starting to get a bit of a lazy latch so we'd stop giving a bottle for a bit.
I know it's still such early days but do you have real life support? La Leche League run regular meetings, there might be one near you. Mine has a Facebook group as well, and then there are informal peer support led groups that meet up. I found them invaluable.
Sorry, this was long - but you're not on your own, it is hard and it is shit but you will get there. You can do it.