Eye doctor here: the only prism I know that goes that high is Fresnel prism which I believes goes up to 30. Any prism over a few diopters in a lens can distort image so much that though it may produce fusion, the image can be degraded to a point it is not usable in visual processing. Most people learn to suppress the turned eye over time, patching will help you see single as well but you lose binocularity. I would consider patching, splitting the prism between each eye and see if you can handle it, or depending on your age/candidacy consider strabismus surgery to lower amount of prism needed (as well as second opinion from an optometrist in person).