anytime you have a work related accident...the company is required by Law to write an incident report and send you to the DR. immediately.

1st...Is this a job you plan on making a career out of, or just something to get by until something better comes along?

I would talk to a Lawyer; Especially since they prompted you not to seek medical attention. They broke the law keeping you on shift after you asked for assistance.
Remember Lawyer works on a contingency basis 33% in these type cases. Costs you nothing up front. Only trick is...Finding lawyer who believes you have a case.

Are you in a Union? Union reps would eat this up!

I am not saying jeopardize your job, but You are entitled to medical treatment by Law...That is a fact. peace, and I hope you make it through OK.