I want to stress
that a given symptom in medicine can have multiple causes and the treatment depends upon the cause. Back to your question, the symptoms which have posted would suggest a possibility of poorly treated sleep apnea
. Further, i dont know what exactly the pressure you need to treat the sleep apnea. For example, if a person need a pressure of 8 and he uses ordinary CPAP machine he will not improve with this, he may benefit with auto CPAP. Another patient who needs a pressure of 14, he would benefit with BiPAP rather than CPAP.I strongly advise you to get examined by a sleep specialist and repeat a sleep study. This will give us an idea about your health condition and we will be able to guide you better.
hope this will clarifies