text_1: Stiff person Syndrome. Please can you tell me what are the early symptoms I have severe cramps in my feet which are twisting into an arc,muscle spasms slowly getting worse and my muscles particularly in my legs are cramping like someone has pushed a knitting needle into them. Started off at night but now happening through the day my back and neck and voice box are also effected and my chest area has now seized to the point of restricting my breathing to very shallow at times I find that I am stretching out involuntarily right through my body and this is becoming more frequent
text_2: What are the symptoms of Stiff person syndrome (SPS) ?