HELP serious sciatic pain!!!

Cayla
I'm currently 15 weeks preggo with my second. 
I have some serious sciatic pain. I need help with stretches and exercises that will help to alleviate some of this pain. 
Even sleeping positions would be great. 
I cannot get comfy for the life of me and need some help. 
I will do anything (anything that is safe for me and my little bun in the oven)