VBA To Increment Sheets With The Same Name By 1

I currently have a spreadsheet that parses a HL7 message string using "|" as a delimiter. The String that comes before the first "|" becomes the sheet name (Segment). The code executes on each line of the string (Each segment is parsed). The problem is that sometimes there are multiple segments with the same name. So instead of a new sheet being created, all segments are lumped into the same sheet with that name. What I am trying to do is have the code create a new sheet for each segment and if there it is already present, add sheet name with an incremented number.

So given the sample message The MSH, SCH, PID, PV1 etc sheets are fixed. The DoHL7Parsing routine takes the line and parses it out in the existing sheet. The problem I'm having is lines that are the same such as AIP get lumped into one sheet. What I would like to happen is have AIP1,AIP2,AIP3,AIP4,AIP5 and AIP6. Each with the line parsed out. These are parsed by segment not fields. I want to be able to recognize the existing sheets and create new sheets if multiple segments with the same name are being parsed.

Sample Message:
MSH|^~\&|SR|500|CL|500|20140804150856-0500||SIU^S14|5009310|P|2.3|||AL|NE|USA
SCH|10262|10262|""|S14^(SCHEDULED)^L|44950^APPENDECTOMY^C4||^^^201408081345-0500^^^^^^2||30|MIN^MINUTES|^^^201408081345-0500^201408081415-0500|10000000034^ROISTAFF^CHIEF^O||||||||
PID|1|5000|50^^^USVHA&&0363^NI^FACILITY ID&500&L^^20140804~666^^^USSSA&&0363^SS^FACILITY ID&500&L~^^^USDOD&&0363^TIN^VA FACILITY ID&500&L~^^^USDOD&&0363^FI^FACILITY ID&500&L~736^^^USVHA&&0363^PI^VA FACILITY ID&500&L|736|DATA^PATIENT^^^^^L||19540214|M|||123 main Street^^SW RS^FL^33332^USA^P^^~^^^^^^N|||||||4221^764|666|||||N||||||N||
PV1|1|I|||||||||||||||||||||||||||||||||||||500|
OBX|1|CE|^SPECIALTY^||^GENERAL||||||S|||||
OBX|2|CE|^PATIENT CLASS^||^INPATIENT^L||||||S|||||
DG1|1|I9|540.1|ABSCESS OF APPENDIX||P
DG1|2|I9||APPENDICITIS||PR
RGS|1|A|
AIS|1|A|44950^APPENDECTOMY^C4||||
AIP|1|A|1000^PHYSICIAN^KT^|^SURGEON^99||||PENDING
AIP|2|A|1000^NURSE^ONE^|^1ST ASST.^99||||PENDING
AIP|3|A|1000^NURSE^TWO^|^2ND ASST.^99||||PENDING
AIP|4|A|1000^ATTENDING^ONE^|^ATT. SURGEON^99||||PENDING
AIP|5|A|115^DATA^PROVIDERONE^|^PRIN. ANES.^99||||PENDING
AIP|6|A|1000^DATA^PATHOLOGIST^|^ANES. SUPER.^||||PENDING
AIL||500^^^OR1|^OPERATING ROOM||||PENDING

Current Code:

Option Explicit

Const HL7_DELIMITER_FIELD = "|"
Const HL7_DELIMITER_SEGMENT = vbLf
Sub DoHL7Parsing(sMessage As String)
Dim vSegments As Variant, vCurSeg As Variant
Dim vFields As Variant, rCurField As Range, iIter As Integer
Dim wsSeg As Worksheet

vSegments = VBA.Split(sMessage, HL7_DELIMITER_SEGMENT)

For Each vCurSeg In vSegments
vFields = VBA.Split(vCurSeg, HL7_DELIMITER_FIELD)
If WorksheetExists(vFields(0), ThisWorkbook) Then
On Error Resume Next
For iIter = 1 To UBound(vFields)
Set rCurField = ThisWorkbook.Worksheets(vFields(0)).Range("A65536").End(xlUp).Offset(1, 0)
rCurField.Value = vFields(0)
rCurField.Offset(0, 1).Value = (rCurField.Row - 1)
rCurField.Offset(0, 2).NumberFormat = "@"
rCurField.Offset(0, 2).Value = vFields(iIter)
Next iIter
On Error Resume Next
ElseIf Not WorksheetExists(vFields(0), ThisWorkbook) Then
Worksheets.Add(After:=Worksheets(Worksheets.Count)).Name = vFields(0)
For iIter = 1 To UBound(vFields)
Set rCurField = ThisWorkbook.Worksheets(vFields(0)).Range("A65536").End(xlUp).Offset(1, 0)
rCurField.Value = vFields(0)
rCurField.Offset(0, 1).Value = (rCurField.Row - 1)
rCurField.Offset(0, 2).NumberFormat = "@"
rCurField.Offset(0, 2).Value = vFields(iIter)
Next iIter
'MsgBox "Invalid or unkown segment: " & vFields(0)
End If
Next vCurSeg
On Error Resume Next
End Sub

Public Function WorksheetExists(ByVal WorksheetName As String, Optional InWorkbook As Workbook) As Boolean
Dim Sht As Worksheet
WorksheetExists = False

If Not InWorkbook Is Nothing Then
For Each Sht In InWorkbook.Worksheets
If Sht.Name = WorksheetName Then WorksheetExists = True
Next Sht
Else
For Each Sht In ActiveWorkbook.Worksheets
If Sht.Name = WorksheetName Then WorksheetExists = True
Next Sht
End If
On Error Resume Next
End Function

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