I am getting worried. I have had a stressful week and had a panic attack a few days ago due to excessive stress and anxiety. This afternoon I lay on the sofa and felt relaxed. All of a sudden I felt something move in my calf muscle like muscle twitching which caused severe painful cramp in my calf muscle. What is worrying me is that I didn’t even pull a muscle or move or put strain on my leg for it to happen. It just happened due to this simple muscle twitch. Is this normal? It’s also worth pointing out that the leg affected is the same leg I had sciatica with a couple of years ago.