Dear
Welcome to HCM
We understand your concerns
I went through your details. I am unable to find your age from your question. Assuming that you are a healthy person in his young adulthood or middle age, I answer this question.
Penis and the
scrotum do shrink when people are nervous, anxious, during
cold weather etc and that is quite normal. You say that it is beyond normal. That is where you have to understand the normal shrinkage. As age advance, the penis actually shrinks. But that proportion is very minute.
Shrinkage happens when the body pulls out blood from that part because some other part of your body needs more blood. Therefore the channelization. this is a natural procedure and you cannot control it. My suggestion would be you don't have to worry unless you have any sexual erection or ejaculation problems. If you worry about this too much, obsession and
anxiety shall result and which in turn can be reason for ED or PE.
If you require more of my help in this aspect, please use this URL. http://goo.gl/aYW2pR. Make sure that you include every minute detail possible.
Hope this answers your query. Further clarifications are welcome.
Good luck. Take care.