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CA law would prohibit your employer from firing you BECAUSE you are disabled. However, that doesn't mean that can't fire you for other unrelated reasons, such as performance reasons. Since you are already on a plan which documents that there are some sort of performance issues here, any disability discrimination suit would likely fail in the event you go on disability and are fired, simply because it is clear that there was some other basis for letting you go and that it wasn't simply "because you are disabled."
As for what your currently employer can tell future employers, the law permits them to make any true statement of fact and any statement of opinion. However, to avoid trouble, most employers just confirm dates of employment. So, this is really your best window to look for a new job right now, before your current employer would be called for a background check and before you are let go so there is no gap in your employment history. Howver, if you are let go before you find a new job, it's not the end of the world. You can collect unemployment benefits (unless you are already collecting disability as you cannot collect both at the same time) and your current employer will most likely just confirm dates of emploiyment if called for a reference.
I hope that you find this information helpful. Please do not hesitate to let me know if you have any questions or concerns regarding the above and I will be more than happy to assist you further.
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