My macbook's hard drive recently got wiped and I'm trying to reinstall photoshop on it. I bought it about 2 years ago and even though I can see the order in my order history, I don't have the option to download it again without buying it!!??

I am providing 2 different version links mainly because you didn't specify the version.

CS5.5 - http://helpx.adobe.com/creative-suite/kb/cs5-5-product-downloads.html

CS6 - http://helpx.adobe.com/x-productkb/policy-pricing/cs6-product-downloads.html

You can also download the trial version of the software thru the page linked below and then use your current serial number to activate it.

Be sure to follow the steps outlined in the Note: Very Important Instructions section on the download pages at this site and have cookies enabled in your browser or else the download will not work properly.

CS5.5: http://prodesigntools.com/adobe-cs5-5-direct-download-links.html

CS6: http://prodesigntools.com/adobe-cs6-direct-download-links.html