Coping with pain

Last night I awoke in the middle of the night with severe pain in both my legs.  I tried breathing into it rubbing it, all the techniques I could think of but nothing worked.  Tears poured down my cheeks.  I finally took some medication which eased the pain and not it is mostly gone.  I know it is'nt from anything I've done as I've been in bed mostly the last few days; I wonder if lack of activity can cause pain.
I feel very alone.  I am grateful for medication that helps and grateful for any help I receive.