Teradata Database - WHERE Clause In EXCEL

Still having a problem with my SQL WHERE clause…

I have three variables on an Excel form that connects to a Teradata database. The first variable is a date format (DateworkedF and DateworkedT) the other two are text fields. (StatusX and ErrorTypeX)

I want to be able to search on any or all of these fields. (If the field is blank return all values)

Query = "SEL SRN_ACCT_NUM, QUEUE_NAME, ERROR_TYPE, SUB_ERROR_TYPE, DATE_WORKED, MONTH_WORKED, DATE_APPLICATION_RECEIVED, ASSOC_WORKED, ACCT_ID, STATUS, COMMENTS, REVIEWED_IND, REVIEWED_AGENT, LOAD_DT " & _
"FROM UD402.JD_MCP_MASTER WHERE " & _
"(DATE_WORKED >= #" & DateworkedF & "# Or #" & DateworkedF & "# IS NULL)" & _
"AND (DATE_WORKED <= #" & DateworkedT & "# Or #" & DateworkedT & "# IS NULL)" & _
"AND (STATUS = '" & StatusX & "' OR '" & StatusX & "' IS NULL)" & _
"AND (ERROR_TYPE = '" & ErrorTypeX & "' or '" & ErrorTypeX & "' IS NULL);"