What do you guys think... Where I work we are short handed, have been since I started. My manger…

What do you guys think... Where I work we are short handed, have been since I started. My manger finally gets 4 days off and yesterday he got called in cause one of the 3 of us got sick. Well this morning I'm ethier just sick or having way bad morning sickness... I can't stop long enough to even drive there 😨 I feel really bad about calling in sick but yesterday I worked my ass off. And today I just can't do it. Im on my feet all day and it's always so hot back there... Should I feel bad? What do you guys think.