I am so sorry to hear of your dilemma. The good news is this problem can be fixed.
First, upload the images that you need to your Auctiva.
Then, you will need to edit each listing and do the following:
In your Auctiva:
1) Locate your listing in your Saved Listings folder, make any necessary changes, add the images, and save.
2) Check the box next to your updated listing in your Saved Listings folder and click the “Get html” button.
3) Copy the html in the popup box.
Then...
4) Go to eBay, sign in, and then locate the item in your My ebay and click the "Revise Item" button.
5) Click "Edit Description", then click the "Enter your own html" tab.
6) Paste the copied html in place of what's there and save your changes. The images ought to be included once the listing has been revised.
Repeat these steps for each current listing that you need to add images to.
Hope this helps.