Ok 1st of all, someone got it right. Hot air rises, so its only normal if ur upper floor is hot.

1. If ur glass is facing east or west, it would be hot in da morning or afternoon, solution, put blinds.

2. If ur roof is of bad quality tiles with a low u-value, it would also transmit heat to your room. Is ur ceiling of gypsum board? I dun think so. Solution, change roof tiles or ceiling, which both are costly.

3. Placing any fans would not help as the hot air will still be trapped in the room. Place a higher static pressure axial fan to suck out the air in ur room. By doing so actually forces the air from floor below to replace the air in ur room which cools it down to the same temperature as downstairs.

4. Air conditioning. No need more explaination.