That deth or mercy be ende of my smert. I you require. I you require. Too much travail so do your train appease - uncertain meaning. Perhaps 'It is too much hard work to satisfy you and your continuous demands'.
Panniers are the sacks slung across a mule's back.
Probably a metaphor from hawking. In His Majesty's Collection. From a print published by J. Chamberlain 1st.