Have you ever tried to evaluate the functions you'd like to plot just for in single position?
Try omega.1(pi/6,1)=
How long does it take? It will take twice as long for every single point in your plot. How long would it take for the whole plot?
Your sheet is too confusing for me to further investigate, but you sure will have to speed things up significantly if you want to make it work without hassle.
Just look how long the calculation of sigma.1 alone takes.