Last time I was seen for my GERD I was told I needed an endoscopy but couldn't afford it, now I can afford it, should I request to have one done?

Well. How is your herd? If you changed your lifestyle and you are eating healthy you may have lessened the injury. Now if you have done this. If you get the endoscopy you will have a diagnosis and then with your healthy diet may be able to halt the damage .
Re-consult. the gastroenterologist, you may not need it, or you may need something different, good luck.
Yes you should. you should get endoscopy .