If all he thinks about is business and all he talks about is business... AND he is dramatically worse from movement (these patients usually shuffle into the office)..., AND, given what you say he is worse from heat... then study on Bryonia.

But, there is not yet enough info here to determine his remedy, but it is a good beginning. Dig around for further important information of him.

Important point: There is NO (repeat: no) reason to begin by considering the remedies such as Nux vomica that are not only "better by heat" but are also strongly "better by being covered". The remedy you pick as this man's simillimum MUST be well known as "worse by heat", as this obviously is a strong point with him himself. Also note: Many remedies have big egos in their mental pictures!! Try to define with more examples how his big ego exhibits itself, then look at the big ego remedies and see if there is a good match, etcetc.