Some good advice in here. You have to treat the cause, not the symptoms.
I went to see a chiro (no names but based on Harris St, Pyrmont) and the pain caused to me was severe. However the pain the following day was utterly excruciating. Her response when I called the next day was "its not unusual to have some discomfort after having your first adjustment"
Oh really? How about the inability to breathe anything more than a shallow breath whilst lying down? Is that that sort of pain usual??
I could go on....
I did find an excellent osteopath (Greg Amer - based in Edgecliff - and is a keen triathlete so has a good understanding of cycling). He was always very good at relieving pain but admitted he couldn't find the reasons behind my particular issues. He told me what they were - rotated and twisted pelvis - he just couldn't explain why.
I was going to write about my experiences with the other practitioners i've seen around Sydney however that doesn't really help you.
My first recommendation would be to see your doctor.
I'd also suggest having a close look at your training programme and ensure that it, along with your riding, doesn't contribute towards muscular imbalances. I know that I neglected the strength in my hip flexors in my training and this has been the cause of my back problems.
Unfortunately, what I have learned over the last few years is that 100 people could present pain in the same area of the lower back but have 100 different reasons as to what caused it. Its always well meaning when someone says "try yoga / pilates / Eastern Medicine etc" but often they can range from ineffective through to contraindicative.
The language that is thrown in there also adds to the confusion.
- Adjustments. WTF? The clicking that occurs in the spine during this is the same as cracking your knuckles. Nothing actually changes. There can be temporary relief but this doesn't change something that is possibly or probably muscle related. There are certainly many, many other causes but I believe you're still quite young (under 30), very active and a gym goer, I'd put my money on a muscular imbalance as opposed to neural issues or disk degeneration.
- Realigning your muscles? I've not heard that before but your muscles are always aligned unless you've experienced MASSIVE trauma.
- You cannot lengthen your muscles through Pilates (not unless they thrown in free surgery)
- Your back doesn't actually move when it goes out. Or if it has, you're looking at something VERY serious because you probably hucked the Opera House.
Dr Stuart McGill has performed a HUGE amount of research and is generally lauded as the world's leading authority on lower back disorders. He's done some great podcasts and written several books. A lot of his research with athletes (I'd almost put you in this category per my above comment) points to simple, easily treated muscular imbalances as being the cause in a lot of LBP patients.
But with all of that in mind, I'd still be very keen to understand your symptoms eg - pain when bending forward, standing up after sitting for longer than 30 mins, pain when sitting or other movements.