Question about sleep apnea and brain cancer/tumors?

does sleep apnea cause light-headedness, dizzyness, and feeling unbalanced. i also have high blood pressure and stress out easily. in the past two nights i've been waking up shaking. the first night, 5 hrs after i went to sleep, it happend. last night two hrs. after i went to sleep, dad and sister woke me up when they got home, it happend. i also don't sleep that well because in my dream i feel like i suffocate and then wake up. the past week i was stressed out because i was going away from my parents with my cousin to my aunt's in Canada for a chek-up over there and today, day i was leaving, i didn't leave because i got pain in the middle top of my chest, but it went away, turned out to be air and gas in my chest. what is the main thing you feel when you have brain cancer/ tumor depending anywhere it would be located? Seizures right. i don't have them.i'm really feeling light headedness but it's also is hot. oh and i also felt chest tightness and presure which didn't let me breath deep. i also felt head pressure and dizzy, but when i forgot about it,or rested on the bed, it went away. is this all caused because of sleep apnea. i haven't gone to the docter or sleep speacialist,but going on tuesday to doctor so might get a sleep study done to so don't say go to doctor.