Do you have a computer at home? Do you share it with anyone? I am sharing mine with my sister. She always bring her work back to do even this evening. I know that she is working hard because earlier she find it difficult to look for a job.
After your age reached 35, do you have difficulty to look for job? Many company would give you a lower salary than your previous job. It happened to my sister! The salary range from her previous to her current drop drastically almost $800 different. That's a lot!
Before you wanted to quit your job is better survey the market or at least get a job offer before you quit. I know my salary range and I can say that its not much. The company do look into your qualification and job experienced.