how to negatively express yourself in Turkish??

like if i wanna say that am about to explode !
or that "am suffocating"
something like:

fena degil: when someone asks how are you, you answer: not bad
canima tak: when you wanna say that you are about to explode

and when to use it ??

When you want to say that you re not so good for example:

How are you ? ( nasılsın )

Not bad, not so good (fena değil)

Or you are so bored:

How are you ?

Im so bored, im about to explode (ben cok sıkıldım, patlamak üzereyim) bored=sıkıldım explode=patlamak üzere=about