Glad I gave you a little smile. I try to control myself here. So far I like everybody I've met here and don't want to offend anyone that may not appreciate the language. After 37 years working with other engineers and then dealing with customers I've learned how to throw the on/off switch.
No words of wisdom for you, wish I had some but I've never dealt with back pain. Best I can do is wish you luck. Spitting nails, ha! I wish I could be spitting thumbtacks again.