If you only have your stuff in the gallery and didn't back it up, you could ask a friend that still has access to the gallery to download everything and send you the files.
As for all other issues, I've set up a thread here with a FAQ: https://answers.ea.com/t5/Technical-Issues-PC/PLEASE-POST-HERE-Questions-regarding-drop-of-32-bit-OS-Support/td-p/7681382/
Feel free to ask any questions/posts problems you have with it.
You can also download and install the legacy edition and play with that if you're on 64 bit. Just tried it and it works. You can set it to legacy in Origin. It does have all the downsides (no updates, no gallery, no DU) but you can play 32 bit that way still.