Given the situation you described, you should be able to get a 1C if you want. You'll need all of the documentation related to the condition, treatment, and clinical visits. As others have said, good chance this will be deferred and they may want you to get a letter from a practitioner stating that you're good.

Call several local AMEs and ask them about this, then work with the one who sounds most willing to deal with it. This should NOT be a big deal.

Also if you think there's the slightest chance you'll ever fly professionally, get a first class medical now. Otherwise if you try to upgrade from 3C to 1C later you might have to jump through all the same hoops again.

The history itself is not grounds for denial in your case, they just need to make sure it's in the past.