Yes I get the same symptoms when my estrogen is too low. Joint pain, lethargy, low mood, and LOW libido. These symptoms are at their worst when I peat perfectly and take vitamin E + aspirin. If I drink a couple of beers I get better libido. When I drink 5 beers I go back to no libido. I think balance is key, and that balance should be on the lower end. Ive seen researchers claim that estrogen signals opioid receptors, so that could be the cause of the increased nerve and joint pains. So Ive been trying to keep estrogen low, but not too low.
I think that avoiding pufa on its own is very effective at reducing estrogen. When you begin adding in additional things like aspirin vitamin E, eating tons of fruit and sugars and drinking a lot of milk and not consuming any starch, all of those things probably cumulate in a situation where your estradiol levels are next to nonexistent, and then we begin experiencing these problems.
My guess is that the joint pain isn't caused by low estrogen, lowering estrogen (which also lowers serotonin) makes you more aware of the problem spots of your body and makes you more sensitive to pain. That's why SSRIs and SNRI's are used for fibromyalgia, the serotonin isn't fixing the pain, it's just masking it.