Brief answer....masturbation doesn't result in any adrenal fatigue or any other harm to your body.
Detailed answer....
Hello,
Thanks for the query.
I have read your query and understand your concern.
Masturbation is a very safe sexual practice which doesn't harm your body physically.
Your semen is being manufactured in the testis all the 24 hours a day.
For most men,it takes between 24-36 hours to replenish all the way after ejaculation and get back their normal sperm count and that's why sperm banks and fertility clinics tell sperm donors to go 36 hours without ejaculation before making any donation so as to give sufficient time to build back their sperm count.
I hope it helps,however you are most welcome to revert to me for any further query.
Best of luck
Thanks

---

Hello,
Normally sperms don't leak in urine,however one may get prostatic fluid in urine sometimes specially when some pressure is exerted during bowel movement.
Foamy XXXXXXX of urine is generally caused by either proteins in urine or if urine goes in the urine pot with force resulting in splash. 
Since proteins are absent in your urine,there is nothing to worry .
Everything is normal.
Thanks

---