I knew nothing of the contract until after I dismissed him, and he referred to it in a letter. Then I found it amongst hospital discharge records.Contracts are presumed valid. You will have to prove in a court of law you were so intoxicated that you did not know the meaning of your acts. That is a high hurdle which you may or may not overcome. Second, you will have to show how come you did not disafirm the contract when you became not intoxicated. It seemed like you had knowledge of the contract and what it meant and intentionally took benefit from it and only now you want it to be invalid. You are a long way and years of hard work from there.
If you could be clear and explicit, why didn't you disafirm the contract then? You will need to choose one strategy or the other. Lessen damages argument or increase chance of liability, not both.
Good luck, let us know when problems develop.
I would not, won't, nor will I ever pay someone hundred of dollars, to do something I can do myself, ESPECIALLY when I've done it successfully before. Needless to say, there's less a chance this will happen when dollar amounts are in the thousands.