Was I wrongfully terminated to avoid a lawsuit regarding my work injury?

I went to see an ER doctor about (at the time) it appeared to be a stiff neck they concluded it was a sprang neck muscle which only could have happened at work. It did not get any better, it got worse so I did the follow up at this point I was told I had to have an MRI done. I told my boss that it wasn't concluded that it was done at work at this time and that I was told by the doctor at my follow up appointment that the MRI would tell us if its work related. My supervisor claimed I did not have any attendance points left therefore if I go to the MRI I will be terminated, I told him at that time I was on a restriction of 5 lbs. with my right arm. He said to go to the MRI and he would talk to HR. Following his instruction I went to the MRI which was on a Friday, that Saturday was a mandatory work day. I showed up to work and I was told I was on suspension because of absenteeism. Later that Saturday I got a fed ex letter of termination from my employer the MRI results came back that I had two herniated discs in my neck and was a direct result of me moving a 1400 lbs pallet manually. I was terminated before the results came back and I did have doctor's notes for me to be out of work for the days that were counted against me.