I've just had a significant period of time off work. Going back today and need to hand my notice in as was offered a job on Friday. The time off work/illness was genuine and supported with surgeon letters and a sick note. Now I know what surgery I need to have to fix my pain I've been okayed to go back to work on light duties. New employer is aware of this and v supportive. Feel bad handing my notice in on my first day back. Just happened to see an amazing job and applied and was offered it! Don't really like my current job but my manager is likely to be really miffed. AIBU to be making myself anxious over this? I feel sick...