Been around the block with this one.
I have had terrible GERD for years. It is exacerbated by my asthma (I know that doesn't sound like it makes sense but it's true!)
My doc told me that losing weight will help a lot. But there were other things he said I had to do:
1. Stop ALL soda drinking (that was very challenging).
2. No eating 3 hours before bedtime.
3. No fruit juices except apple & white grape.
4. Very little tomato-based sauces.
5. Very little coffee/black tea. Decaf green tea/herbal tea okay.
Also, as was mentioned, raising the head of your bed can be quite helpful. Just make sure to raise the bed, not your heads with pillows (I made that mistake).
I know how hard it is! But those suggestions helped me a lot and they certainly can't hurt! This is just my opinion, tho. If you can't afford to go to the doc maybe talk to a pharmacist about the over-the-counter GERD meds. He/she may have some good info for you.
Good luck & hope you get to feeling better!