Hi, this morning I didn t feel my usual self- thought I must be coming down with something. 4 hours ago, I went to get out of my chair when my legs suddenly became cramped, weak and twitching- i couldn t walk and could feel both legs trembling- I immediately sat back down, this feeling lasted for an hour, in- between I attempted to get up. I still feel weakness in my legs now, 4 hours later. Do you know what this could be caused by? Many thanks, Christl