Returning to work tomorrow after 21 days off.

I got double pneumonia and I haven't worked since November 7. I am returning tomorrow and I am very nervous as to how my other co workers and managers will treat me. I have only been there since October 9th and am still fairly new. I emailed HR a copy of my Dr. Excuse and they seemed OK with it and said "we will see you Thursday then." Just still really nervous. I have honestly forgot a lot of the job. Any advice?

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