I have experienced this today:

Mosin pristine
compensator pristine
long range scope badly damaged

when in 1st person the aim will jump along the x-axis OR the y-axis when completely zommed in (RMB). it is NOT swaying, the aim JUMPS. First it was jumping along the y-axis, half an hour later along the x-axis. my character was not breathing heavy, was prone, no broken limbs, stress, etc.

zooming in only half the way (using + and - on numkeys) sort of fixes this because the jumping seems to only start at a certain point.

Just because you spawn hungry and thirsty doesnt mean that it's too high. Have you ever eaten and drank alot in the game? then ur satisfied for hours without drink and food!