I am having major muscle spasms in my lower back. I have been diagnosed with Sciatica?

Hi I am in a lot of pain right now and can not lay down. I am having major muscle spasms in my lower back. I have been diagnosed with Sciatica about 3 months ago. Long story short I did a light workout exactly a week ago which caused my right knee to sprain. Two days after it was Friday I started feeling my sciatic nerve pain come back. Now it exactly a week later. I went to the hospital last night, and also this morning because the spasms are unbearable. I don’t have a family doctor at the moment. They gave me a prescription for flexiril which has helped me in the past but this time it seems to be getting worse. I am restless and everytime I go to lay down the spasms start. I am traumatized by the spasm attacks from these last 2 days I don’t even want to bother laying down but even when I try it literally makes me want to die that is how bad the spasms are. I know usually what to do to subside the pain, but NOTHING is helping. Nothing. I am 24 yrs old. Female. 150lbs. 5’1 height.