I have a doctors appointment schedueled for tomorrow, so don't just tell me to go see a doctor, give me your opinions, thanks.

for the past month I've been feeling sick. I have lightheadedness, I feel tired, I'm a little bit more forgetfull than usuall, I have sensitivity to light, sensitivity to cold and heat, nausea almost "sea sickness", to sum it all up I feel like I have a feaver without the actuall feaver, and the lightheadedness and nausea are really getting to me. what is wrong with me?

I also had 2 headaches in the past month, one was brought on by lying down.