Headaches, fainting, balance issues...

For the last few weeks I have been suddenly starting to experience these kind of symptoms. This week I have fatigued and fainted three times for, In my opinion, no reason. I also have had instances where I suddenly drop an item from my hand or lose balance and fall randomly. Very strong headaches have happened too and for some reason my eyes are very light sensitive at times.

I have tried googling, but I don't want to believe it's a brain tumor. Is there any chance it could be ? I am after all only 20 years old and I am rather fit. I eat and drink regularly and my sleep schedule is normal. I hope it's not what i fear it is.