On the one hand, you have the data. On the other hand, you have you - and your response to the noise. One is quantifiable and objective; the other is unquantifiable and subjective. To paraphrase Mr Holmes: Once you remove the impossible (flights are lower - they aren't; engines are noisier; they aren't; flight paths have changed - they haven't (and least not for a long time and brief trial notwithstanding), flights are more frequent - marginally but negligible.. Once you have removed these, then what remains must be the truth. And the truth must be that it is you and your response to noise which has changed. If you can accept this, then you will start to notice the aircraft noise less. If you can't, you will only notice the (same) noise more and more and drive yourself crackers.