Morning Stomach Pain - Any Advice?

Get a doctor's advice to find out the cause and appropriate treatment. 2 tips until then would be to lay on your left side (this reduces reflux & relaxes the stomach itself, which may be part of the issue). And maybe sleep with a heating pad nearby, so you can use it on your tummy as you're waking up.

My anxiety used to make me so nauseous in the morning.

you should see a doctor if you can! try to rest and not overwork yourself <3 i hope you feel better soon!!