Sleep apnea??

Hello bondhas I’m facing a problem for the past few months related to sleep. Though I’m having 7 hours of sleep everyday I’m feeling always tired and sleepy during day. Unable to concentrate on work in office. sometimes light headed ga kuda anipustundi. I snore a little and I’m overweight. Am I suffering with sleep apnea? If so how to detect? Any specialist should I consult? Need your suggestions bondhas