Feeling crazy is a typical reaction at some point after date rape.

Feeling crazy is a predictable reflection of pervasive date rape denial and victim blaming. When you are told repeatedly by people who are considered credible that reality cannot possibly match your actual experience it is normal to feel like you might be crazy.

If you are a rape survivor who feels crazy that isn't proof that you are suffering from a mental illness. The feeling could come from having your experiences invalidated or it could come from post-rape trauma.

This feeling of being crazy post-rape is the source of this quote:

What doesn't kill you makes you stranger -- Marcella Chester

Survivors Aren't Crazy ...
but many people's actions and statements contribute to rape survivors feeling crazy or being dismissed as crazy.

Some survivors are mentally ill, but so are some non-survivors.

Rapists are often calm after rape and claim that their victims are delusional for interpreting consensual sex as rape. For some people believing the rapist's lies and/or rationalizations is less disturbing than believing the truth.

Many people wrongly assume that post-rape behavior and manner are proof that the person who was raped was not raped. Some of these people are identified as experts.

Incorrect but firm statements from people rape survivors trust personally or because of expertise can cause survivors to question their perceptions.

More information related to beliefs about victim craziness or causes of symptoms which are mislabeled as craziness

Defense attorney: stroke victim only imagined 2 rapes
In a case in Washington state where a nursing assistant was accused of raping a hospital patient the defense's argument led to a deadlocked jury.

Social support after rape impacts PTSD
A study found that negative social reactions and coping through avoidance have the highest correlation to whether the survivor will develop PTSD. The negative effects of self-blame were also related to negative social reactions.