Okay, clarification here.
There are two different types of FSA's. There are Health FSA's and there are Dependent Care FSA's. Both are heavily regulated.
A health FSA is for medical expenses that are not covered by insurance. You can use it for doctor's office visit co-pays, deductibles, eyeglasses, dental expenses, co-insurances, and many other things. They can be used for you and for your spouse and for your dependent children at least till 18. Possibly over that - you'll have to check your specific plan.
A dependent care FSA is used for child or elder care expenses. The reason I asked above if you misunderstood what a dependent care FSA was for, is that despite the fact that we write it in the literature and have little pop up boxes during the enrollment process with the definitions, we have so many employees who mistakenly choose dependent care FSA's thinking it is for the health expenses of dependents, that we send out e-mails to employees who elect it for the first time asking if they meant to do that and telling them what to do if they did not.
Both types of FSA are heavily regulated and cannot be changed at random mid-year. The maximum amount, by law, for a dependent care FSA is $5000 per household; the maximum amount, by law, for a health FSA is $2550 per person. (If both spouses have access to a health FSA, they can each elect one for $2550 - the same employee cannot elect $2550 per family member.)
I hope you didn't just accidentally elect a health FSA as well since the language I'm going to give you on Monday will not help you with a health FSA, only a dependent care. On the other hand, you have a better chance of being able to utilize the health FSA.
One thing, though, if your Open Enrollment period is in November for a January - December plan year, at least it will be a short lived problem. By law, FSA's have to be re-elected every calendar year. As long as you don't make an active election of either FSA during your OE period, it will all be over as of January 1.