Right side pain from shoulder to leg.

From last 3 years I have right side shoulder blade pain and upper back pain issue. Sometime it redirect to right chest also. Recently feel pain in the right lower back and right leg . cervical spine ap lat was normal did 1 year back. I have low vit d so taking that weekly. Recent pain feel like Sciatica but the confusion is shoulder blade and upper back pain was there for 3 years. Not sure that the shoulder pain and upper back pain also can be Symptom of Sciatica. Sitting work - less activity from last 5 years WFH I'm 10 kg overweight and hepatomegaly with Grade1 fatty change Currently trying to reduce weight GERD (under control) What is the actual cause for this ? which test I should do early so that management and possible treatment can be possible . Thanks in advance for your valuable suggestions