When i m stressed i feel warm sensation or liquid flowing around my scrotum and testicles. why? what is it?

Anxiety shows itself: In may ways. Once can mentally obsess over things that frighten the person or do behaviors to keep danger away, e.g., ritual behaviors, checking and re-checking. Physically there can be heart palpitations, shortness of breath, sweating, sleeplessness, etc. Please go to a mental health professional for support if you think you have an anxiety disorder. See doc first to rule out physical issues.

Sounds like anxiety: but some form of neuropathy or nerve irritation/damage could produce these symptoms. I would see your physician or other health care professional for a complete evaluation, and perhaps a referral to a urologist is in order. I would at the same time look into your stress situation (what are the stressors, can they be reduced) and your response to it to see if things can be improved.