Doesn't want to start sometimes and it died while driving. Help.

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Okay. To start off, my first problem with this car was my fog/parking lights would no longer shut off. I have to disconnect the battery every night. Well then all of a sudden, one day it wouldn't start. Figured fuel pump. Next day, I tried it and it started right up with no issue and drive fine. Next time, it again wouldn't start. Tried 20 mins later an it started right up. It ran fine at first once started when I had this issue. Then one day my dad got it started and was driving it. The car died out or stalled on the highway and wouldn't start again. Had it towed and got it home and it started right up. So frustrated! My brother and dad think possibly a fuel pump relay? They plan on building some kind if bypass for it? But my friend doesn't think it's the fuel pump relay. He is telling me it's all electrical problems and to get rid of the car asap. But I cannot afford to just junk my car. Please help. I need my car fixed bad.