Does counseling work?

im 17 years old and im an awful mess. im so screwed mentally, i have bad, sad, and painful thoughts, im bothered by problems everyday, theres a problem ive had for over a year with my eyes and i have no idea the severity of it. i dont know if i need surgery or if i can take eye drops or whatever because i dont even know exactly what it is im suffering from.i havent told my parents, i plan on telling a counselor if i see one. im so scared and the problem eats at me everyday because i stuffed my feelings down and i fear within an inch of my life that i may need surgery...can a counselor help me?