Aids dementia or normal sleep apnea?

For the last 20 days im suffering from sleep apnea symptoms which slowly progressed from last year. My cognition problems have also gradually increased from last year. Im finding it hard to understand simple conversation sentences these days. My hiv exposure was 9 years back. My hiv tests last year were all negative. Tridot, western blot and pcr all negative but however im having sleeping problems (wake up due to breathlessness as soon as i fall asleep and waking up with the urge to urinate). Im worried it might be due to hiv related cognition problems. Im planning to see a neurologist tomorrow. Can anxiety cause all these cognition problems? Can it be psychological. Im worried it might be central sleep apnea caused by hiv.