I have an update.
It appears that my coworker couldn't handle the work alone (which is understandable) and caused more grief to our reporting manager. I also found out that majority of employees called in sick on the first day that I called in sick, which caused my manager some grief.
When I came back from my sick leave, it didn't appear that anything has changed until the following day. We are getting an extra employee to help us, our manager is being transferred.
There are some other issues, but I rather not get into it since there are some positive things going on at work.
Thanks for all your support.