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Unfortunately, lawyers do not make the laws that govern spousal support. It may very well be unfair that you are not going to receive spousal support, but courts generally do not favor awarding spousal support, and it is generally only awarded when one spouse does not have the ability to earn an income, usually due to the fact that they did not work for a long time during a lengthy marriage. Your lawyer was right in that it hurts your argument for spousal support because you have a master's degree. The court will not look at your actual job performance, but at your qualifications and ability to earn an income. The performance and reviews will be seen as up to you, but you have the basic qualifications necessary to support yourself. Perhaps your lawyer was not very sympathetic to your situation in this case, but I think that he was providing you with an honest and realistic opinion of your case. It is much harder to get spousal support now than it was in the past.
It is also true that you could have included spousal support in your agreement, but since the agreement has been finalized and executed, it will be very difficult to persuade a renegotiation of the agreement which includes spousal support. You could always request your lawyer to discuss the possibility of attempting to negotiate spousal support, but I agree that it will be very difficult at this point to include it in your agreement.
I am sorry I don't have better news for you. Please let me know if you have any additional questions.