Hi, Masturbation (hand practice) is a normal physiological process. Once a person becomes sexually mature, semen production starts which is a continuous process. A person the either has sex, or masturbates and has night falls. None of it causes any kind of problems. Masturbation doesn t lead to any physical or mental health problems. Your symptoms of tremors and getting nervous are suggestive of an underlying anxiety disorder. I would suggest that you should consult a psychiatrist for complete evaluation and initiation of treatment. Medications like paroxetine could be highly beneficial in your condition. I do hope that I was able to answer your query. Best wishes for speedy recovery.