Completely normal but difficult when your going through it. My son was resucitated, problems with breastfeeding, tongue tie, reflux etc, those first few weeks were literally a blur, so emotional, so many tears, so many 'what ifs' about the future my mind was just blown. Get all the support you can from your midwife and then HV, honestly they are so used to dealing with it. I also had help from the breastfeeding midwife who when she went through her assessment really helped me understand that what I had been through was actually pretty full on, lack of skin to skin and all the things that are proven to help both mum & baby.
All I would say is there is lots of support out there and take every bit that family, friends, neighbours, health professionals offer as it really does help. Go easy on yourself, my worst days were days 3-5 and then day 15ish, it will come in waves. There is no handbook just do what gets you through. My lo has turned a year and its just a different ball game completely, I no longer check hes still breathing, worry about when he leaves home etc, I enjoy him on a day to day basis. Try not to listen too much to those thoughts, its just your body trying to readjust and you will feel back to a 'new normal' very soon xxx