Maybe you should consider using a Table of Contents for this? If you don't want all headings and the ones you do want:
• employ a heading Style that's not used for other things, just specify that Style;
• are found only in one part of the document, bookmark just that range and specify that bookmark; or
are scattered throughout the document at different Heading levels, apply TC fields to the ones you want to reference and specify that,
the Table of Contents field code. Anything that requires you to manually insert 150 such references is going to be laborious; a macro really isn't going to make that any easier when, as you say:

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]