It sounds like we're all doing pretty well!
I'm on my first day solo as DH has gone back to work today. I was not too anxious about it as 3yo DD1 is at nursery on Mon and Tues, then at ILs on Weds, and I have decided to stick to her routine as she loves it. But she woke up with a fever on Saturday that hasn't shifted, so she hasn't gone to nursery today and I have taken her to the doctor. She has a nasty throat and chest infection, poor love, so is on antibiotics and her asthma inhalers. Not quite the start I was expecting, but I'm quite proud of myself for coping so well with the two of them this morning (had to park in the world's smallest space outside the surgery, master the spare car seat for DD2, breastfeed DD2 in the waiting room, and persuade DD1 that antibiotics aren't the spawn of the devil).
DD2 is being a star. She'll be two weeks old tomorrow and is feeding well (put on 7oz in five days last week), and being very kind to me at night (goes three and a half or four hours between feeds at night, and feeds are 30mins max including nappy changes) so I'm feeling well rested. Well, I would do if I wasn't up with DD1 who refuses to take paracetamol!
Hope everyone is feeling and doing OK. My best advice is to not panic. Do what is best for you and your baby as a happy mummy equals a happy baby. I really beat myself up last time over giving DD1 formula, but it was the best thing I could have done as I didn't have enough milk and she was starving. As soon as I started giving formula (after struggling on for three weeks), she became much more contented and settled, and I was much less stressed as a result. I also gave a dummy last time, despite swearing that I never would. But DD1 was a terribly sucky baby and needed it. We dropped it with no problem at three months and she found her thumb. So go with your instincts.
Take care x