OP, this is so hard for you both, I am sorry.
Did they discharge him from hospital with an ‘enablement package’? The pressure should not be yours alone.
Have Adult Services done an OT Assessment, again for help and any home adaptations?
You say when his mobility improves: so he is expected to improve? Are they sending a physio to help him?
It is a huge change in a relationship when one becomes a carer, difficult for you both.
My friend had counselling, alone and with her partner, when her partner became permanently disabled following cancer treatment.
If your DH is left with permanent disability, can you look at applying for Attendance Allowance, which can go to any help you choose; cleaner, gardener, carer to help him bathe, anything!
This has affected you both, so look after yourself however you can.