After rotator cuff surgery-pain at night and 'catching' feeling

I had my surgery 7 weeks ago, supraspinatus, subscapularis and open biceps repair. During the day I am mostly OK with little pain but every so often there is a ‘catching’ feeling (sharp almost pin point pain on top of my shoulder. It almost feels like one of the tendons is getting caught up on one of the anchors. The big problem is at night. I slept in a chair the first week, but lying flat causes sharp pain on top of my shoulder. So bad i have to get up and take pain meds. Anyone with similar complaints?