I think you may be confusing FMLA with ADA accomodations. They are not the same thing, and the eligibilty criteria are not the same either.
FMLA is unpaid leave. If you, the employer, and the medical condition all qualify (and a doctor will confirm that you have a "serious health condition" as defined by the FMLA statute), you are entitled to up to 12 weeks of unpaid leave which can be taken either in a block or intermittantly. You CANNOT legally be fired for using FMLA as long as you do not exceed 12 weeks; your employer CANNOT deny the use of FMLA if all the criteria are met. The only accomodation under FMLA is that the employer has to allow you to take it.
Under the ADA, if you have a qualifying condition you are entitled to a "reasonable" accomodation that will allow you to fulfill the essential functions of your position. A SHORT non-FMLA leave can be in some circumstances a reasonable accomodation, but likewise the employer is not REQUIRED to provide non-FMLA leave under the ADA either if there is another accomodation that will fulfill the purpose.
It is VERY important to note that the criteria to meet the definition a serious health condition under FMLA, and the criteria to meet the definition of a disability under the ADA, are NOT the same. It is possible to qualify under FMLA but not the ADA; it is possible to qualify under the ADA but not FMLA.
There is only one condition that is automatically covered under the ADA and that condition is HIV/AIDS. Every other condition, without exception, must be looked at on a case by case basis. The fact that it appears on the JAN does NOT mean that each and every person who has that condition is covered. Although the law has recently expanded and clarified who is covered, it is still necessary to review the individual condition against the definition and to see what accomodations are available by YOUR employer and for YOUR position. An accomodation that it is reasonable for IBM to provide may not be reasonable for the mom-and-pop grocery down the street; an accomodation that will work for the sales manager will not necessarily work for the receptionist.
A few things that the employer is never required to do under the ADA:
1.) Eliminate an essential function of your position (as opposed to a non-essential function)
2.) Bump another employee out of their position to give it to you
3.) Create a position for you within your restrictions
4.) Give you the accomodation you want or even the one the doctor recommends (only one that works)
It is my opinion that a message board can never say for certain what does and does not qualify under the ADA or say what accomodations would be reasonable. Those issues are FAR too situation specific for us to try to make those determinations. But the first thing to determine is first, whether FMLA, the ADA, or both apply. For that you need to talk to both your doctor and HR.