There are a couple issues here. Generally speaking the fact that your employer may have acted negligently by not initially providing you with the appropriate assistance is not an issue. In the world of MO Work Comp, issues like negligence are not taken into consideration. The main point is that you suffered an injury that arose out of the course of your employment. Since that seems to be pretty clear, you now need to concentrate on making sure that your rights are protected.
Basically you are entitled to medical care (doctor chosen by your employer) and payment of your medical bills (for the doctor chosen for you by your employer), payment for your lost time from work (2/3 of your avg. weekly wage) for every week you are off of work, subject to a maximum. This is called TTD or Temporary Total Disability. Finally, you are potentially entitled to lump sum payment for the perm disability that you have in your back and your shoulder, if any.
You note that you have been told that you would get $400 to $500 a week for being off of work. That is a tax free figure. If the calculation was done correctly, it should equal 2/3 of your gross avg. weekly wage- which should not be that far off of what you were netting out before the injury, unless of course you were earning above the maximum TTD rate which is currently $807.48.
Once you have been released from the doctor, you can then start to consider what your perm. disability is in connection with bringing the case to a close.
Remember, since it looks like your shoulder injury may be considered a significant injury, you may be entitled to additional benefits from the Second Injury Fund, for the combination of your shoulder injury and any prior disabilities if applicable.
I hope this helps.
Daniel Lefton
314-231-1166
1-800-231-5852 ext 1166