It is normal for the prospect of a job change to be a little scary, but, frankly, your work situation sounds even scarier. Granted that this is a time when many people are putting in long hours and working very hard, most are not at their wit's end.
It appears that your work is no longer inherently satisfying, enjoyable, or motivational for you, and that you are being smothered by it. The apparent lack of support, guidance, and reinforcement from management is not helping the situation either. In fact, all that this job offers is a paycheck, and that is one typical formula for career dissatisfaction and ultimately self-dissatisfaction.
If you can handle the stress, strain, and frustration of this job, you can certainly handle the anguish associated with changing jobs. At the same time, it might be helpful for you to consider getting some career guidance and counseling. There are plenty of firms that do this very well, and you can check with your local college and university placement centers as well.
Your current work situation sounds quite unfair, and you are being unfair to yourself if you do nothing about it.
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