Can you bottle feed and take pain relief?
Also, lots of babies have got to nursery at three months when parents go back to work. It might be worth looking about and talking to a few to see if they would be able to support.
I would also get a large, A1 wall calendar and mark in where I can get help- can your partner book his holiday for next year now and spread it out (Fridays off for a month in January so you know you only have four day weeks alone for a month, for example), mum come to stay first week of Feb, other family members and friends to stay...This would give me some peace of mind and let me plan for when I know I am unsupported.
Have you looked for mum and baby groups in your area? Contact them and explain the situation. They are usually really friendly and an organiser may have suggestions and be able to come round to talk to you about local support for parents.
Your husband must also make it as easy as possible for you to be left alone to care for your baby. Obviously, I don't know details of your medical condition but would a mattress on the floor with the baby's bed next to it help you lift/ place down/ sleep by the baby? I have a snuzpod which means I hardly have to lift my baby during night feeds. An electric baby rocking chair might help as you wouldn't have to power it. He needs to leave you food which doesn't need preparing.
Can you also have an emergency contact available? Do you have neighbours who could have a key for example?
I am sorry if I am overloading you. I just want you to know there are options and there is support; your husband needs to organise it as soon as possible to help stop you worrying about the future instead of looking forward to it as much as possible.