I understand your feelings and I will try to share my experience but keep it short.
I dated an entrepreneur/workaholic. The most brilliant man I have ever met and very successful. He was a workaholic to the extreme. He would invite me over and keep going to his home office to check on business stuff on his computer. He was late for everything we planned because of his business. The difference here is that this man had a very successful business and made a lot of money. So, my point is that if this workaholic trait is a persons innate personality, success or failure will probably not change it.
I loved this man, I respected and admired him. He took me to lovely restaurants and bought me beautiful gifts. Finally, I could not take the lack of time he could give to cultivate our relationship.
If you feel that you can deal with this type of personality once you get through this crisis then my advice is just to give him some time. My ex would tell me “you don’t get me, I am not a banker with 9-5 hours and I never will be”, he would sometimes half break up with me for not understanding but he always came back. I finally ended it, not because I did not care for him but because the relationship was not meeting my needs. Give him time….take a step back, I think he will sort things out and come around…..if you are still waiting and available. But live your life in the meantime.