Should I buy discount supplements

I have not been feeling very well recently. It all started when I got a new job six months ago. The job is unlike anything I had been dreaming of, but I guess it is better than nothing. And they pay well, so I won"t complain. But unfortunately, I have to sit in the office for long hours. Sometimes I leave it in the evening when I"m completely exhausted. I thought that perhaps I should take some extra vitamins or minerals to improve my concentration and memory. I have found a company that sells discount supplements online but I am not sure which products to choose. I might try some omega-3 supplements, niacin, vitamins B6 or B12 and folic acid. But if I take them all at once, I will not be able to come to any conclusions. I want to find out which product is really good for me. I guess I will order some good vitamin B discount supplements first. If this doesn"t help, I will try something else. It the moment, I am trying to change my lifestyle a little. I need to get enough sleep and eat a healthy meal every day. I have also decided not to work overtime any more. I need to have a dinner every day and get some rest in the afternoon. Taking supplements is only a part of the process, I suppose, buy I hope they will help me as well.