If you want to have a go yourself, have a look at the tools
here, in particular Partition Recovery may help you. These tools should give you a report of what, if anything, can be salvaged. Be very sure before you ask it to make any changes to the disk. It may be that the trial version will only report and that you have to buy a full version before it will actually recover data.
(These are just representative tools that I found from a quick Google of "recovering files from a formatted disk". There are others and someone may be able to give a recommendation of a good, free tool.)
Normally I would recommend taking an image of the disk onto another hard disk and working on that, but it sounds like this may not be an option in your case. The very best chance of recovering your data would be to take the disk to a data recovery specialist, but this tends to be rather expensive; you have to balance the worth of the data with the cost of recovery.
I wish you the very best of luck with this. It's a situation that most of us have been in at some time or other. Remember, in future keep separate backups of anything that is important to you.