Helo am 19 yrs i hav problems wit my left testicle, when i sit it swells & wen i lay down & press it somethin drops inside gently & it decreases, help?

Hydroceole/Hernia: Sounds like a communicating hydroceole with or without a hernia: if the passage from your abdominal cavity to your scrotum on that side has not closed off spontaneously, then abdiominal fluid can pass in and out of the space around your testicle. The passage (a patent processus vaginalis) is also the site/cause for a hernia. You should be evaluated by a urologist or general surgeon.