I smell like feces.

Okay, Basically I'm a young teenager suffering from a fecal BO.
I've heard all the comments, "It smells like **** in here!" or "Who's farting." and "Someone needs to take a bath."
I've heard it all, It's truly hurtful and it's pretty difficult to go on with everyday life.
People have started to dislike me because of it.
I can really make a BM on my own without straining, and even when I do it doesn't all come out.
Also it seems like when I do make a BM its like my anus won't allow all of the feces to come out.
Like it's constricted or something.
Sometimes when I feel a big BM trying to come out it's like my anus/rectum won't allow it or something, like it contracts at all the wrong times.
Also I've been having problems with my vision as well,
Like at night when the lights are off, One of my eyes is darker than the other, Like in one eye I can see almost fine in the dark, but in the other it's completely dark. Also I've been having these twitches lately, they occur almost daily.
In my arms, legs, eyelids, thighs, and etc.
Also one time when I drank some alcohol it literally felt like acid and I felt it pass through my stomach.
Then a sort of sharp pain ran downward to my vaginal area, so I just STOPPED drinking.
And sometimes I can feel blood in my throat, like I can smell it, so I don't know what that's about.
And I also get severely bloated to the point where it makes me look pregnant.
I really need some help.
And I forgot one thing if I drink something to sweet or too sour I get heartburn, or if I eat pizza or something.
Also smells can give me heartburn too.