Hello Ben_E,

                    l remember it well,do something-feel exhausted-drag myself to bed and collapse into-rest for how ever many hours-recover-get up and do it again--repeat over the coming months very gradually gaining slight improvements.The end result some years down the line made the effort worth it though,its like being in the lead role of Wile e coyote,always being thrown off the cliff ,plunging downwards but somehow never quite hitting the floor, heigh -ho enjoy and appreciate your recovery,

                                                                 best wishes, David