The slow urine flow and blood in urine are signs of prostatitis.  It is common with increased inflammation. 

The fact that you are easily startled is a sign that you have a dominant sympathetic nervous system.  

http://www.veroniquemead.com/sns.php

This will eventually lead to adrenal fatigue.  I had an exaggerated startle response many years before I developed adrenal fatigue.

Basically….your body is stuck in fight or flight mode.

Research different ways of calming your nervous system: Meditation, Healing codes, Amygdala retraining, yoga.

Herbs/supplements like Holy Basil, L-theanine, Valerian Root can help.

Stay away from everything that stimulates:  coffee, chocolate, action movies, p 0 r n o g r a p h y, self-gratification, and excessive exercise.

Magnesium and/or calcium deficiency can cause muscle weakness and muscle twitching.  Magnesium and calcium are lost during stress.

Cold extremities is from your blood vessels being constricted, which happens with you sympathetic nervous system kicks in.