So sorry to hear you are suffering OP.
i have had on/off sciatica for about 18 years (since first pregnancy).
things that help me:
electric heat pad. has been a life saver for me and I find it more effective than hot water bottle. I’ve got a biggish one from Amazon and put it on my bare skin to maximise the heat. I love it.
long full body support cushion. And lots of pillow options at bedtime. I have to sleep with cushion between my knees, supporting my thighs and feet, sometimes behind my back to lean on (I’m a side sleeper).
yin yoga. Very gentle stretching that allows you to find your limits and not go past them.
really careful workstation set up. Screen/monitor at eye right, no stooping, a good desk chair. Lots of stretch breaks when sat at laptop.
ibuporfen / voltarol gel rubbed into muscles near pain. I find this better than tablets and easier on the stomach.
TENS machine , I have a 4 pad one so I can zap more areas at once.
Absolutely no lifting / twisting when it’s flaring up. No hoovering. No carrying bags or pushing shopping trolleys.
tell people you are in pain and can’t lift etc. so they know to offer help.
sending love and hope you find relief soon xx