Could it be associated with emotional stress?
Contractions on the top of your stomach??? I'll assume you mean involuntary muscle spasms IN your abdomen rather than 'on top of your stomach'.
Stress can manifest itself in a variety of different ways depending on its severity and duration. Muscle spasms in your stomach (without or without other symptoms like nausea or diarrhea)? At what time of the day? The sore shoulder and stiff body are likely probably caused by by your inability to relax properly by the sounds of it; even when asleep.
Do you take any medication for the PTSD? If you were and told us we could rule in or rule out possible medication side effects.
Regardless, if it is bothering you or causing concern, it will not hurt to see your doctor who will hopefully have your medical history.
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