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My first piece of advice is to stop doing anything and disconnect the drive. Based on what you are saying, your drive is likely in the early stages of a head crash. Running data recovery programs against the original drive and putting it into the freezer is sucking any life the drive has away without ever copying one sector of data off of it.
Plan A - Take it to a data recovery pro. At the very least, they can quickly tell you whether or not your data is recoverable and how much it would cost to get it back. My guess is that you are looking at a price anywhere between $500 and $1500, depending on the company you use and the severity of the problem.
Plan B - If the data is not worth wasting a data recovery pro's time, you will need to start by doing a sector by sector clone of the drive. Any software that you will have access to will, at best, skip the bad sectors and hopefully copy the good ones. If the heads are failing, you likely won't get very far. If it is just a few pockets of bad sectors, you should be able to get a fairly clean copy of your drive, on which you then run the data recovery software.
The odds are, your drive will completely fail before you get a full copy. So, be 100% sure that you don't want to take it to a data recovery pro. If the drive completely crashes while you are trying to do it yourself, your price will go up significantly and the chances of getting your data back will go down proportionately.
One free clone program I recommend is gnu ddrescue that runs under linux.
Good luck.
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