Comments tables corrupt – how to fix?

I recently posted asking for help because when I login to my dashboard, and I click ‘comments’, the page fails, and loads blank, before being able to generate any html. I had someone look into the problem for me and they said it is because my comments tables are corrupt. Here is what the person said that looked into it:

– hes got 12000 comments

– he set no limit to char input for these comments

– php cannot retrieve so much information from db at a given time.

there are many routes to go by to fix this, which one sounds like a best fix

get into db and drop tables or

alter core files to retrieve huge amount of data…

If there are any wordpress programmers out there that know how to fix this problem, I am willing to pay.