Universal credit notice

I got my UC notice yesterday. I have a self injury behaviour of hurting my eyes when stressed. I am due to have an operation in the next few months, a corneal teansplant as my vision is just so damaged from the behaviour.

DWP is one of the main triggers. If I hurt my eyes after the operation then I am in serious trouble and may go blind.

Does anyone know if you can delay the move to UC for a long period? I know you can delay month at a time but this is not enough for me and will still cause such distress. Thanks for your help.