The first thought I have is to make sure both of you are communicating as clearly and directly as you can, to decrease the possibility of misunderstandings. We often make assumptions about what our partner means, thinks and desires. Voicing our thoughts and listening to theirs helps us know what will and won't work. Don't forget to communicate your needs and wants to your wife. Your wife's arousal or her ability to physically respond might be compromised due to pain and medication.
Some antidepressants can inhibit orgasm.
Together, talk to her physician frankly about this aspect of your relationship. Your wife might be able to alter her medication or add something to help temporarily. Also, focus less on orgasm and more on the whole spectrum of your sexual relationship. Could Be Waiting for You. Inc. All rights reserved.