Hi I had the same problem and was at the mercy of too low of a fee I sent.
I'd been waiting 36 hours and then tried this:
https://www.viabtc.com/tools/txaccelerator/ I have no idea it might be a coincidence but it confirmed within the hour. transaction I.D, looks like this for example: a87ed56f7867f5de24844ee1fb36ed2d369436c2f6585d7c3dc54390eb5d2307
click on the transaction in multibit-- you'll find a link to view at bitcoin.info where youll see this long string at top in web address...copy paste to accelerator. It may not work but worth a shot! weird how it went through a half hour after I did that. let me know how it went.
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