ok depending on what your starting endurance was use this equation.
x= starting endurance
y= starting strength
A= current health
B=starting health
D= health at current level
z= unknown integer
c= unknown integer
this is as close as you can get
(x+y)0.5=B
(68-x)/23=z
so your endurance went up by z points each level, so level 2 would put your health at
[(D+z)0.1]+D=A
and level 2 would be the same equation but with different values for D
so if your starting strength was 30 and endurance was 30 , this is what your current health would be
(30+30)0.5= 30
(68-30)/23= 1.7
this means that your endurance would be 1.7 points higher each level so at level 2 your health would be
[(30+1.7)0.1]+30= 33.7
the next level would be
[(33.7+1.7)0.1]+33.7= 37.24
and the next
[(37.24+1.7)0.1]+37.24= 41.134
and in the end you can round up or down to get a whole number. but this should give you the exact amount of health you should have for your level or pretty close to it.
im glad i payed attention in math class, otherwise i would have never been able to come up with that equation
so i hope that helps, just follow that equation until you do 23 levels, but you have to remember your starting endurance so that you dont go over 68, or under 68. i would do the equation for you but its 3:45am here and im to tired and i dont know your starting enduranc