Need advice: Notice period, medical leave, WFH request, and being pushed to lead a new CR

I’m in my notice period. Just after submitting my resignation, I got sick and had to take medical leave.

I don’t have proper accommodation in my work location. I stayed in a PG for the whole year after we were called back to office. I couldn’t upgrade due to low pay. I highlighted this to my manager earlier but nothing was done, so I finally decided to resign.

Due to my sickness, I now need to stick to home-cooked meals (PG food isn’t working for me while I recover). I’m from another state, so I asked for work-from-home till October end. But they only approved it till the first week of October. My manager said that since I just resigned and then got sick, “things are complicated.” I understood what he meant. He also mentioned that since I took two weeks of medical leave, we’ll need to “discuss the LWD.” I didn’t say anything then.

Now I’m stuck in between — I have doubts about my LWD, and I genuinely don’t know how I’ll manage in PG food while still recovering.

On top of this: I’ve worked here for 4 years and own a module. A major development was coming for this module since last year, but approvals never came. Suddenly now they are in a hurry, and they expect me to lead this CR. The original rough estimation was 2–3 months, but my LWD is November 15. Till now, there’s no proper documentation, but I’m expected to start working with whatever information is available.

I’m afraid they’re going to push to increase my LWD. I honestly have no wish to work here anymore. My manager hasn’t discussed anything properly yet, hasn’t even asked me to plan KT, so I don’t know what he’s thinking.

I need some ideas — how are notice periods usually handled for developers? What can I realistically push back on?