Please tell me what are wrong~

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Unfortunately, since financial conditions was still unstable, I could not study with working part-time job. Once again I had to postpone my studies. Honestly speaking, I was really frustrated, but I thought I should faced the music and had to overcome through it. So, I got a full time job which was a personal assistant of instructor who taught English to high school students. Although the fact I could not study like my friends did not disappoint me, but I was almost knock down on account of working itself. As my boss was working at cram schools, he was always busy teaching from here to there, and I was supposed to be with him to assist. I had to work day and night approximately five days a week. There were always working stuff that only I could deal with. That was why I exhausted physically, but I kept working hard so that I could make money for my tuition fee. Finally, following year, I returned to school again.

It seemed that there were no hardships anymore. But this time, my health was getting worse. At first my feet and arms are swollen and hurt. I thought it would be fine in couple of days, but I was wrong. The symptoms were getting bad and ,eventually, I could not walk even a step and eat meals on my own. My family and I were very worried about a certain fear that I had bad disease or something. What even worse was there were no doctors who could diagnose accurately. So my pain was beyond expression. At last one doctor diagnosed me as autoimmune disease. Since I had never heard about that before, at first I didn't know how it was serious. Actually, I could have died or had aftereffect if the treatment have been delayed or inappropriate. Thanks to family's care and application of proper medical treatment I am here where I am supposed to be originally.