this morning i thought i may have stopped breathing because my fingernails took a grey blue appearance and i needed to "test" myself to see if oxygen was responsible, as brain damage rightly makes me paranoid. so i made my breathing very shallow, still getting a small breath or two every 6-10 seconds, but making sure to exhale completely for several minutes, and then was to check on my fingernails for cyanosis. when the first experiment yielded no conclusion, i repeated probably 3 more times, in shorter intervals. when i was marginally satisfied that my skin color had little to do with my air intake, i put my finger in an oximiter (measure blood air saturation to give my mind peace). i started to breathe as i had during the questioned period (and how i breathed thereafter) for a few minutes and saw my oxygen level go from 99% to 98%, on a constant staircase downward. i continued this for a few minutes, managing to spike my o2 levels to 94% or possibly lower for a few infinite seconds, to realize my brain may have been sufficiently deprived of oxygen for some time. i panicked and to make sure my oximiter wasn't buggy, retested myself 3 or 4 more times, bringing my blood sat levels to 95 and 94 percent, still now believing each of these tests on the validity of the oximiter caused more brain cells o die, even if i was only that low for no more than 5 seconds. in total i spent a fair amount of time not breathing today, and by textbook definition a fair amount of time hypoxic, with apnea. do you think i lost brain cells or caused brain damage from my neurotic worsening of the scenario which initiated today's events? thank you