Thanks for the question.
The fluid is joint effusion
and it signifies that you have injured joint structures. You need to see a joint specialist who will take into account MRI
findings to propose appropriate treatment.
You have not provided MRI findings in detail for me to make more detailed comment.
Other important thing is that you might have injured neuro-vascular complex near shoulder. That might be reason for not feeling anything. Even this needs to be checked sooner.