Sciatic pain

Thought I had a fair few months before this one kicked in😅😅 I have been at work today for 7 hours, not sat down apart from to have a wee. Wearing probably the worst shoes for it! (Flat and thin on the bottom) as i wasn’t expecting a busy day. Could feel my feet and ankles increasing in aching pain through out the day, and when i sat in my car after work and finally breathed it was almost like, shit. Only then i realised that my back was hurting, specifically that sciatica like pain in the nerve right above your bum🥴🥴🥴 Currently lay in the bath hoping that would ease any muscle aches but Its genuinely doing nothing and my back is really sore! Any recommendations other than paracetamol and better shoes tomorrow😓I had the worst sciatica with my little girl but that wasn’t until 3rd trimester, now i’m terrified this is going to be my life till September!