Wow, I've never heard of that at all. You must be special :)
Okee-dokee, the first thing for consideration -- is the castor oil organic? If not, you may be reacting to toxins? Is the fiber 100% natural (cotton, wool, or silk) and if it wasn't organic (I didn't tell you get organic, I know...because that's not really necessary, or shouldn't be)...did you wash it thoroughly with non-toxic soap before using it? (just wanting to make SURE it's the castor oil itself that's causing this, and not toxins).
If you're sure the castor oil & fabric is toxin free, and you're using a heating pad...put the heating pad on the area for the same length of time, and see if you get any reaction from that. It could be the EMFs from the heating pad. The adrenals are VERY sensitive to EMF's :(
Check all that and STILL get the same reaction? I can't imagine what it would be (grrrr)...but I'll give it a try:
I'm one to ALWAYS listen to our 'doctor within', and it SEEMS like perhaps your doctor within is telling you to stop or move it to a different location. But it's very possible that the castor oil is 'doing it's thing' and moving/adjusting things in your liver - and it's the 'moving/adjusting' that's causing the reaction.
SO, you've done a Liver Flush and prep work, you were thinking about starting coffee enemas...so how do the sounds in the stethoscope change/vary from when you did the flush, the pre-flush work and the coffee enemas (if you tried them)? THAT will tell you a LOT...because if the castor oil pack sounds are much more intense than any other sounds you've heard so far, then perhaps it's doing you a world of good and you'd want to 'tough it out' and see if it normalizes.