Welcome at HCM.
I have read your question completely.
It looks from your details that you are suffering prolapsed disc at L4-5 level.You are also having symptoms for that.At present you should do following to have relief in that-
-Take strict bed rest
-Take a good analgesic
like advil or aleeve.There are some other medicines like tramadol
,pregabaline or gabapentin
which should only be taken after consulting your doctor & in severe pain
-Do warm fomentation over your back.This will help in reliving spasm.
-Take the help of a good physiotherapist who may help you in learning some exercises.
-After a period of bed rest ,when you are pain free,you may do following strengthening exercises-
Hope this all will help you.
With best wishes.