So sorry you had to experience this Claritytoo. It is just awful. If you have any muscle soreness apply a heat pack on those muscles. If it happens when you are with your T ask them to help you move the part or your body if you are comfortable with it. Body memories can knock the strength out of your whole system. Try to rearrange your day so that you don't have much to do.
When things happen I try and dig my hands into the muscles to get control. At other times I ask the part inside what to they need or what do they want. Sometimes they say nothing. At other times they will tell me what they want or dont want and I can say something to them to comfort or reassure and amazingly the tension goes.
I so wish I could bring comfort to you.
Take care