Different people come up with different illnesses. He did not have all of the illnesses people attribute to him. What you get is easy to see. It is the risk seeking, highly evil, highly intelligent, highly charismatic leader we see from 1933 to 1940, not the weak, old-man we see in 1944. Early on Hitler was much more able to adapt his strategies to meet long-term goals than his later paranoid years. He adapted in Munich, Narvik, and Molotov-Ribbentrobben pact. It is impossible to say what he does differently, but he probably make fewer mistakes, which might have some large impacts. For example,
1) Cancel Kursk at last moment.
2) Better 1942 decision making in Army Group South.
3) Allow the early jets to be only fighters, not bombers.
4) Better forces deployment in France in 1944.
That looks like a wish list on how to win the war for Germany rather than an assessment of medical problems on Hitler's decision making ability.
Hitler in 1942 was still thinking clearly enough.
When talking about his judgement it's important to remember that from 1933 to 1942 he had been right about almost every military decision. Even his mistakes were nothing compared to those made by other leaders.
These decisions had often been made against advice from his generals or advisers. When you think you've been right from 1933 to 1942 and have 'proved' yourself to be a better strategist and better leader of men than so called experts you aren't going to suddenly take advice from the lesser men who surrounded him in 1943.
Hitler was gambler who acted against advice when he entered the Rhineland in 1936, planning to invade the Sudetenland in 1938, invade Poland, trying to push the German army into invading the West in November 1939 with winter coming, invading the Soviet Union without accurate intelligence reports and no winter clothing, not retreating on the Eastern Front in December 1941.
Not listening to advice and being inflexible was his style. That's why we nickname power crazy people who don't take advice and make unreasonable demands a 'Hitler'.
From 1933 to 1942 he got away with it. After 1942 he didn't. IMO Better health would simply have made him even better at not listening.