Splendide, I felt like you do 6 years ago, after the birth of dc3. It was awful and I look back to that time with sheer horror.
Because I was at my wits end and felt so bad I could not see it getting better ever.
Looking back, I'm amazed I actually got in that dark place, I already had dc, I had bf both, I just fell into a hole.
You will get through. I remember looking back at that time with confusion as to what the hell had happened. Like everything was a shade darker, not just all my thoughts but everything I looked at. Even in the brightest sunshine I saw clouds.
Sleep deprivation turned me into a wreck. I was on medication for a year, it helped me to be able to talk about what's going on. Before I wouldn't even see anyone as I felt it was pointless anyway.
That time is now a distant memory, and I have a special eye on any new mum in my friendship group. There is struggling with new motherhood, and there is drowning in a sleep deprived hell. There is help.
People suggesting formula do so because then dh could do feeds and you could sleep.
Only you can decide if that would be ok for you. I was desperate to bf back then and I'm sure it made my life harder, but my mental recovery quicker. I would have felt I failed her as I've bf dc1&2 and my self esteem wasn't the best. I would decide differently now.
You have to tell your DH how you feel. Don't expect him to know what to do - mine certainly didn't and thought a back massage and cup of tea would fix it. You have to tell him to take time off work if he is still planning on going back next week. You need him there 24/7 for the next few weeks.
and ((hugs)) even though I'm not a hugger, I'm a rather tough cookie and a coper. The strongest people need help too sometimes.
What are your plans for xmas?