Help with sciatica / back pain


I’ve had to take today off work because the pain is so bad, I work an office job with extremely uncomfortable chairs sitting down at a desk from 8:30am-5:30pm with little moving around, and very un supportive bosses, I start my mat leave on feb 1st so it’s only 4 weeks away but I don’t know if anyone’s got any help on how to get through the days before then?! Paracetamol doesn’t help and hot water bottles don’t do much good either🤦🏻‍♀️