The condition you are describing fits
into - obstructive sleep apnoea
. You needs to get a Polysomnography/ApneaGraph Sleep Study done which can diagnose this and also tell about the severity of problem. After wards drug induced sleep endoscopy
or cine MRI
can be done to see the site of obstruction and treatment planning which can be surgical or CPAP or both. You also need to loose weight (if you have a high BMI), quit smoking
and start some physical exercises (Lifestyle changes). All these things can be done if you visit a sleep specialist/sleep clinic. Sleep in lateral position usually helps so do the raising of head end of your bed.