Dr. Jolie Bookspan - my back hurts worse when i try to stand in a more neutral s!

i guess if you haven't read her books on the topic you'll just respond with lots of thoughts she has already covered. and no, the info available from her on the web isn't everything available in her books. i have a bit of an exxagerated spine curve. it's not severe but it's enough that my back hurts if i dont spend enough time on my feet and it can hurt after riding horses which i do roughly once a week. my trainer makes sure im not doing anything like arching my lower back or something really bad for my kness for example, but... when i try all the suggestions to simply stand in a neutral spine i get immediate back pain and it lingers the more i try. i cant sleep on my back i try all the time but will lay awake all night. i think that alone would go a long way to helping the prblem fix itself along with staying on my feet instead of sitting at a computer like ive done basically all day every day for the past decade. if anyone happens to be good witht his thing i'd love suggestions