ow do stop my computer from flipping from my current ID to my original ID when all apps and updates were purchased after I changed to my new ID? I can't update any of my apps?

Any purchases made on your old ID still require the password for that old ID in order to update the apps.

Similarly, any apps that you buy using your "new" ID will only update if you use the new ID's password.

Apps and other purchases are linked to Apple IDs, not to the computers on which they reside. So in order to update or download items, you must use the Apple ID that was used to purchase the item. There is no way to merge accounts or transfer purchases. There isn't a whole lot you can do now. Instead of creating the newer Apple ID, the correct option would have been to replace the existing email address tied to your old Apple ID with the newer email address.

Since you now have two Apple IDs, you will have to use both to update apps unless you buy the apps again using your newer Apple ID.

It will only show the old ID if an app tied to that ID needs an update. Similarly, if your computer is tied to your old ID (such as when you first bought the computer) it will require that old ID for preinstalled app updates.

Don't post personal information on this forum. It is user to user, not a direct conversation with Apple.