Can I extend my support for a couple of more years until I am better?

You may be able to but it is important that you file before the current order expires. Please contact a family law attorney asap.

You will have to file a motion to extend the support due to your disability.

You need to see whether support is modifiable in your judgment. My guess is that the court would not extend it as you received it for 1/2 the length of the marriage.

In California, making changes based on "forgetting" to ask for your separate property inheritance and separate property personal injury settlement (assuming it didn't include lost earnings from times during your marriage), will be impossible in my opinion, but I would advise getting other legal opinions from attorneys who can read all of your case documents and can review the law and case law in your area. A Judgment is a very important document and the time to make sure it's right is when you are negotiating the settlement, not years later. The Spousal Support may be extendable, you need to get legal assistance to determine from the Judgment, whether it is even possible, and if it is, you will need the legal assistance to plead your case, as it will be difficult.

There are two key questions to be addressed before your main one can be answered: 1. Did the court retain jurisdiction to modify support? If not, there is nothing to be done. A good family law attorney should be able to determine this by a quick review of the judgment. 2. Was the support non-modifiable? If the answer to #1 is no, the answer to this is almost certainly yes. But even if jurisdiction was retained, if support was made non-modifiable, you are probably out of luck. Again, a good family lawyer should be able to answer this quickly by reviewing the judgment. If the answer to #1 is yes and #2 is no, then the same lawyer can counsel you on your chances and the cost of getting the matter back before a judge.