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Hello and thank you for using JustAnswer. I am very sorry that you are having these issues related to not wanting to have sex with your husband. There many possibilities for why this low libido may be occurring such as hormonal or neurochemical changes. Have you discussed this with your OB/GYN and to get a hormone blood test to see if your hormone levels are within normal range? Would you be willing to either go to a psychiatrist for possible medication or a Sex Therapist to discuss this issue?
I cannot tell you exactly what is going on without a face to face evaluation unfortunately, but there this does appear to be more of a psychological issues and I do believe that seeing a Sex Therapist will help bring clarity to the problem, but it will not happen over night and will probably take months for you to at least understand what is going on and how to resolve it. There is also a possibility that the medication, especially if it is a SSRI antidepressant, can lower one's libido which can be having a contributory effect to this, but most likely is not the sole cause since you do have some sexual attraction others (including women).
I hope this answers your questions and gives you some guidance on this issue. Please let me know if you have any questions or concerns as I am happy to assist and support you regarding this issue.