Occasionally having a bad day at work is normal but if you are complaining about how miserable and unhappy you are with your job frequently, I am afraid it is a clear sign that either you need to make adjustments to your current job or it's time for you to make a career switch.

When you make up your mind to make a career switch, you should continue to do your work properly as you normally would do. Do not burn bridges that you might need in future. Change your career in such a way that you manage it carefully without offending your current parties or leaving bad blood on your trail.

When handing issues like notice of disengagement, hand-over of work or relations with your ex-employer and colleagues, you should do it in a professional way and leaving them a positive note on you. If possible, try to build up a track record of having good references from ex-employers that will prove useful for your future job search.

You should build good relations with your previous colleagues so that you can seek them for advice, technical assistance, job leads and other helpful support. During your process of career change,

there are times when you will be in doubt. What you should do when that happens is to aim high. If you are torn between becoming a engineer or doctor, choose the highest paid career that has the most demanding qualifications requirements.

It is good that you try the hardest first, even after you find it hard or dislike the job, at least you know you give it your best and did tried it. Remember to constantly upgrading your skills by going for further studies. It is easy to move to a field with limited educational requirements but to move up once you get started, you need qualification to prove your skills.

Do not be surprise if your prospective employer becomes wary when he reviews your resumes and find out that you have been leaving each of the previous jobs you held. You should be more understanding although you may have perfectly legitimate reasons for leaving.

One way to disguise your frequent moves is to use a skills-based resume or you could present yourself as a consultant, thus this make your short contracts looks acceptable.

Refrain from talking negatives about your previous employers but be positive instead. No matter when you are planning to leave your current job, you should not lose all interest in working hard in your current position. That is bad and will tarnish your image quickly. Your boss and co-workers will definitely appreciate if you do your work well before you move to your new job. 

Always keep this in mind. It is better not to anger anyone by slacking off before you quit since you will never know whom you are going to work with or for in the future. A self-defeating way of destroying your chances of securing your job is to post hundreds of jobs sites or "blasting" it like spam to hundreds or even thousands of potential recruiters and employers. 

Spam, defined as unsolicited bulk commercial e-mail has become common in the job seeking market and brought significant expense for companies. However with "spam filter" software, your spam messages will be deleted, unread, without any notice to the spammer. Even if it is successful, most recipients will probably view it as spam and ignore it. 

You should never try your luck on it. One disadvantage of blasting is you are not able to customize it for the specific employer and thus reduces your changes of being noticed and called. Following up the resume with a phone call or email is impossible and your application will be struck in the process instead of moving forward.