When laying down or sitting, I feel a pressure below
May I know how long have you been dealing with this pain? Can you describe the pain - a dull ache or burning sensation?
What other symptoms do you have beside the pain - nausea, abdominal fullness or vomiting or fever?
Awaiting your response...
not specific to liver inflammation....
The area of discomfort you referring to is not specific to a liver pathology. Liver inflammation causes pain at the right upper abdomen below the ribs and not at the shoulder blade close to armpit. What you may have is a muscular pain or sometimes a lung condition. I would suggest to try over the counter pain medication and see if you get better; else a clinical examination and chest xray will be needed.
A liver function tests that also test liver enzymes will rule out liver inflammation if you still feel it is due to liver issue. You can discuss it with your treating doctor.
Hope this helps. Let me know if you need clarifications.