It sounds, to me, like your low back and hamstring muscles are holding too much tension at the hip and as they fight for control they are tilting your pelvis as you move through your swing. Remember that your trapezius (shoulder) muscle connects to L5 and the deep and superficial erector muscles (they run vertically in tandem along the spine from your occipital bone to your sacrum. Without seeing your posture it is hard to be specific but you need to focus on compound lower body exercises that allow you to develop better cooperation. Ofcourse it goes without saying that you need to make sure you have the same level of flexibility above and below the hips. You should be able to sit on the floor with your legs outstretched together and create a right angle. Most people have to lean back of the sit bones. That is a simple check. If this is the case then place your arms behind you and straighten your back, that doesn't mean a vertical back. use your abs and your chest and try to move in millimeters over a few weeks, ok maybe months, until you can sit, without pain, with your shoulders stacked over your him and your back straight.
It's a start but we need more information. I will be checking in to see if you want to explore the process further.
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