About the solution
Another solution I found is to put on top of a large pads breastfeeding pillow those bent on "u" inverted, with the curve upward to support the head and the tips of the "u" down, but arranging them in order to better support the spine.
This solution shall not include mention to the use of drugs, chemicals or biologicals (including food); invasive devices; offensive, commercial or inherently dangerous content. This solution was not medically validated. Proceed with caution! If you have any doubts, please consult with a health professional.