Welcome to the forum!
It sounds like you have a lot of different things going on. First, the lumpiness- that sounds like plugged ducts or engorgement. Is the lumpiness worsening, or does it improve after baby nurses? And are you doing any pumping in addition to nursing? If so, how much milk are you getting and how often are you pumping?
Not opening wide and getting frustrated after a few minutes of nursing- that could be due to the thrush, since thrush can make baby's mouth uncomfortable and that can lead to nursing issues. But it also sounds like fast letdowns, which might match well with the fullness/engorgement/plugs you're experiencing. Can you describe what baby is doing a bit more thoroughly? If he pulls off the breast, what do you observe? Is he not opening his mouth wide at all, or does he initially latch well and then slip back into a shallow latch?
Being difficult to wind doesn't necessarily mean anything. Many breastfed babies do not require any windi at all- I never bothered with my babies. What would happen if you didn't bother with the winding routine?
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