Can losing weight cure sciatica?

Probably not cure but help. Exercise may also help. Have you seen a medical professional?

Depends on the cause and a doctor can find out what that is.

Sometimes it can go almost as quick as it comes.. definitely see a doctor.. exercise does help also ice packs or hot water bottles depending which works for you.
Try and sit correctly and if you have to lift an item remember to bend your knees do not strain also don't just slump on the sofa correct posture as much as possible.
Ibuprofen/paracetamol etc... for pain or what the gp percribes.

An awesome advantage of low-affect aerobic exercise is that it can give long haul alleviation from your sciatica symptoms. This is on the grounds that high-impact practice goads recuperating supplements and oxygen to your lower back, reinforces the muscles around your spine, and builds your adaptability.