My sickness record at work is excellent.
I'm working my notice period at current job but feel dreadful today. I haven't slept well at all and feel very much out of sorts. My mental health isn't great at the moment and I'm exhausted. I'm literally getting in at night around 6pm, having tea and then falling asleep. I just feel guilty for ringing in sick. I just need some time to myself to get better though.
Relationship with employer has been rocky in the past but has massively improved recently. Don't know if that makes any difference.