Soooo exhausted

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I get up at 6 am every morning drive for 40 mins to my job and leave at 6pm at night then another 40 min drive home I’m on my feet alllll day bending over people running up and down stairs 😩 I’m so tired ! I’ve got 4 more weeks at work left- I’m just really struggling to work through the full week Monday to Friday it’s really taking it out of me has anyone got any tips and is anyone the same ? I’m so tempted to call in sick some days because I’m so exhausted- I’ve been great till I hit 31 weeks 😔