Is the clause in the Egyptian marriage contract stating "Both parties affirmed that they are free from diseases that permit divorce" considered a condition for freedom from diseases? And is it obligatory to inform the suitor about the obsessive-compulsive disorder that one suffers from? And what are the diseases that permit divorce in a marriage contract?

The phrase "spouses being free from defects" refers to their freedom from defects that necessitate a legal option (khiyar fiqhi), and obsessive-compulsive disorder is not among them. Therefore, the marriage is valid even if you did not inform your husband about it. However, if the husband stipulated freedom from a specific defect, even implicitly, such as through the description given by the guardian, and then he finds that defect, he has the option to annul the marriage or continue with it.