Sciatica HELP

I keep getting numbness and a pins and needles sensation around my thighs, genitals and all down my leg. I’m 17 and I’ve been diagnosed with sciatica recently but have had it for 5/6 months now. I looked on the NHS website to see what I should do and it said to go to A&E; straight away. Does anyone know if the pins and needles have to be constantly there or just sometimes. It’s concerning me a lot