Finding Multiple Values For Specific Individual Through Multiple Sheets

I am working with a nonprofit to set up their financial ledgers. There is one workbook with 12 sheets, one for each month. The goal is to be able to set up a formula that searches through all 12 sheets for every donation that a specific individual has made. For instance, let's say that John Smith gave x amount of money on 1/1/2000, y amount of money on 1/10/2000, and z amount of money on 2/2/2000. This data will appear on 2 different worksheets. I have the following formula, which allows me to look through one sheet at a time:

{=INDEX(Jan!$B:$B,SMALL(IF(Jan!$A:$A=Smith!$A$2,ROW(Jan!$A:$A)),ROW(1:1)))}

Where Column A in each sheet is individual name, and column B is amount donated. Sheet "Jan" is the data for the month of January, and sheet "Smith" is the culmination of John Smith's donations for the full year. Using this array function, I am able to retrieve all data for John Smith in the month of January, but I can't find a way to make one function that searches for all of John Smith's donations in each month. Is there a way to build an array function in VBA that would accomplish this?