PFM, Sounds like you are doing all you can do to get some help.
Do you have an employee handbook from where you started this job? If so look at how long you have to wait for coverage with pre-existing conditions. Or ask for some paper work on the ins coverage.
What bothers me is this sounds like discrimation, which by federal or state? law is illegal. Call your state ins commisioner & inform him/her of the situation. Hopefully it is an 800 number & not alot of hoops to go thru, but...don't give up. YOu deserve the same ins everyone else is getting with the co you work for.
Hope this helps.