All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger.
There is no doubt that what your husband did is contrary to the teachings of the Sharee’ah. Him being in seclusion with a female doctor and talking and laughing with her without a need, all this is forbidden in the Sharee’ah and we have already clarified in many Fataawa that being in seclusion with a non-Mahram woman is forbidden and we also clarified that a female doctor should treat women and not men unless there is no male doctor who is competent in treating men, or that there is a necessity or a dire need for her to treat men, because when a female doctor treats male patients, she would touch them and see their ‘Awrah (parts of the body that must be covered in Islam), and this is not permissible unless in case of necessity or dire need as we clarified in Fataawa 85492 and 123505.
Hence, you are obligated to advise your husband in a gentle and wise manner and to remind him that it is forbidden for him to transgress the Limits of Allaah. To do so, you may make use of beneficial tapes and books which clarify that it is forbidden for a man to establish an affectionate relationship with a woman outside marriage. Also, you should try your best to keep him away from that clinic where there is that female doctor.
Finally, it should be noted that it is not permissible for you to be rude to your husband, rather you have to deal with him as a husband who has all the marital rights on you.
Allaah Knows best.