I uninstalled then reinstalled the wallet and lost all my swap history.

If you uninstall the extension, you will lose your history as it lives inside that extension. If you had a pending swap during which you uninstalled the extension, please contact us via Support on the bottom right corner on our website or join our Discord channel and we will help you recover your swap. If you do not see the Intercom icon, please email us at support@liquality.io