I am worried about man stuff, can someone help?

So, about two years ago, someone close to our family passed away. I went to visit her in the ICU at one point. About a week after she passed on, I began to feel heavy chested. I went to the doctor, had it checked, was fine. Then the headaches started, and my first thought was a brain tumor. Got a CT scan, EEG, blood tests, etc, and nothing happened (the brain stuff was a little over a year ago now). I was having trouble concentrating, was seeing floaters, and a little ringing that later went away. I also felt a bit unsteady. I visited a neurologist who gave me an EEG, which came back just fine, and he suggested that it might be anxiety. I saw a psychologist who said it was apparent I had anxiety. So about a week ago, my stomach was hurting, so I went into urgent care, and they said it sounded like acid issues. they took urine, felt my stomach, etc. Lately I have felt some discomfort in the groin area (almost like a gas pain), and i have noticed that in around my right testicle, there seems to be a squishy mass (almost like a balloon full of water) and it's usually not there when I sit down or lay down. It isn't painful if I squeeze it, and I had my doctor check it out about a year ago (who said it all seemed fine). Now I am all freaked out that it is testicle cancer....I am a 23 year old male, no history of any cancer or illness in the family, very awesome genetics and longevity. But I keep freaking out about this stuff. I always feel like I am in a daze or a dream, like I am a ghost or something. My stomach is discomforted a lot as well. I began taking Zoloft about a week ago, which I definitely feel is helping take the edge off (even though I just started), and I actually feel a bit more lively, but I am still a worrier through and through. Please help with any advice! Much love!