Because waking up every day hating the fact you will be spending most of it sat at a desk doing something you loath is not good for your mental health or your productivity!
So why don't you look for something else instead of being stuck in a job you hate if its effecting you that much? That's no way to live life is it?
I've worked IT for over 10 years, I enjoy my job and I've been in my current role for 8 years but I know it is time to move on. I am self studying, doing my exams, once Ive passed them I be looking for jobs outside the UK in the same industry and moving. Heck, never stopped from my friend putting his house to rent, taking his wife and kids to work in Dubai.
I don't get this, you could say first world problem "I hate my job but I am going to stay here anyway because it pays the bills" We live in a time where there are so many opportunities out there, especially to progress further in the world of technology but just stopping there in your comfort zone (because its the easiest thing to do), while loathing your job and not making a change is no way to go about it.
One thing I never do is tell people not to work in IT. We still need them in our industry