I will agree that the more time you put between the IA and your current situation, the easier it will be. But if the IA covers just your freshman year, I can say there have been applicants (seniors when they applied) who were not just contrite but also served on honor/conduct boards to go beyond and show you learned a lot from your mistake. You need to have some help with your student conduct administrator and perhaps a prehealth advisor (if you have a committee/institutional letter process) to get the right language to talk about what you learned from this mistake if you are asked about disclosing your IA. Many of those senior-year applicants were able to gain admission to the schools that were a mutual fit. The interesting challenge is the fact that your IA is at another institution, so you won't really know what their policies are about disclosure under FERPA. They wouldn't tell your current institution about the infraction in all likelihood, so you may have to go to the first institution's student conduct office where the infraction is on file.