Many guys lose libido on a cycle, even a straight testosterone cycle so don't worry about it. Under or over-dosing of an AI can throw your oestrogen too high or too low which can adversely effect libido. Prolactin can build up which can quash libido. If you're taking nolvadex, that can do it.
You're going to have to find your own way through this to see what keeps you functional. Proviron can help at 50mg ED, upto 100mg ED. You could try some cabaser for a while at 0.5mg E3D or E4D. Vitex or chasteberry can possibly sub for cabaser. Sometimes, just increasing your cardio can do it.
Now that you're on winny, you've taken away one of the early indicators of over-dosing an AI which is achey joints, since winny can do that anyway. I'd start with a lowering of the AI unless you're experiencing signs of high oestrogen. Your cycle is almost over, though, and the HCG will begin soon. Some guys have mentioned that taking a low dose of HCG throughout cycle can also help to maintain libido.
Meanwhile, Cialis, Levitra and Viagra are your safety net.