There are so many reasons for sleep apnea,
It can be genetic, obstruction, overweight etc.
Yes Sleep Apnoea can lead to overweight, HTN, heart disease, high cholesterol,day time sleepiness.
Next Steps
Firstly you need to be evaluated for your BMI and obstructive cause.
Thereafter need to do home based polysomnography. And then things can be decided
Health Tips
reduce weight,
sleep on left lateral position
avoid sleeping pills