Handling multiple and duplicate emails for Google MailApp - loops

Question

I am trying create a script for Google Sheets that does the following:
1) triggers on a certain date
2) compiles information from columns based on a date criteria
3) sends an email digest of multiple column values to each unique triggered email row
I've looked up several alternate examples, but I cannot grasp the syntax to handle step 3.
The data is generated from Google Forms submissions.
Submissions are added continuously. Script has a time-driven trigger.
I want it to compile all data for entries by the SAME email respondent on the triggered date AND separate out data intended for different email addresses.
I've grabbed a script and altered it to the best of my ability. (see below)
Currently, it produces the following results:
1) script triggers correctly based on date
2) compiles information from triggered columns and reports in one email to all addresses from triggered rows. (incorrect behavior)
Currently the script runs a 'for loop' to grab all triggered data for body of email and sends ALL data to ALL emails. I understand why it does this but I can't wrap my head around how to execute 'step 3' above.'
I think I need to create an object for the email data and run another "for loop" to isolate the reference email.
I'm not sure where to go from here, or how to grab the column value to isolate the required email.
Spreadsheet layout:
Column A: Timestamp
Column B: Recorded Email
Column C - F: Personalized Info
Column G: Requested Followup Date
Column H: Days Remaining until Followup Date
Data set starts on Row 2
Email is triggered when Column H reports value of 0.
Thank you in advance for any and all assistance
Current Script:
function checkReminder() {
// get the spreadsheet object
var spreadsheet = SpreadsheetApp.getActiveSpreadsheet();
// set the first sheet as active
SpreadsheetApp.setActiveSheet(spreadsheet.getSheets()[0]);
// fetch this sheet
var sheet = spreadsheet.getActiveSheet();
// figure out what the last row is
var lastRow = sheet.getLastRow();
// the rows are indexed starting at 1, and the first row
// is the headers, so start with row 2
var startRow = 2
// grab column 8 (the 'days left' column)
var range = sheet.getRange(2,8,lastRow-startRow+1,1);
var numRows = range.getNumRows();
var reminder_date = range.getDisplayValues();
//grab DOB column
var DOB = sheet.getRange(2,4,lastRow-startRow+1,1)
var DOBrange = DOB.getDisplayValues();
//grab ph# column
var phnum = sheet.getRange(2,5,lastRow-startRow+1,1)
var phnumrange = phnum.getDisplayValues();
//Admin Date of 1st shot
var Admindate = sheet.getRange(2,6,lastRow-startRow+1,1)
var Admin = Admindate.getDisplayValues();
// Now, grab the patient name column
range = sheet.getRange(2,3, lastRow-startRow+1,1);
var patient_info_values = range.getValues();
//grab email
var Emailrows = sheet.getRange(2,2,lastRow-startRow+1,1);
var Emaillist = Emailrows.getValues();
var sendit = 0;
var msg = "";
var greeting = "This email is to remind your team to followup with the following individuals. \n \n";
// Loop over the days left values
for (var i = 0; i <= numRows - 1; i++) {
var days_left = reminder_date[i][0];
if(days_left == 0) {
// if it's equal to 0, do something with the data.
var Adminreport = Admin[i][0];
var patient_name = patient_info_values[i][0];
var DOB_name = DOBrange[i][0];
var phnumgrab = phnumrange[i][0];
msg = msg + " "+patient_name+" DOB: "+DOB_name+" Phone#: "+phnumgrab+" First dose given "+Adminreport+" \n\n";
sendit++;
}
}
if(sendit)
{
MailApp.sendEmail(Emaillist, "Followup Reminder", greeting + msg);
}
};