Hi yes absolutely a detox reaction. Even though I am doing only the LSD as opposed to the NSD, my first couple of days on the LSD were awful. I had sinus pain, headaches, sore joints and trouble sleeping.
I have kept a food diary since I started and have found this really useful for monitoring reactions. It took a month on the diet for me to write 'starting to feel good

'
Yesterday I tried a piece of shortbread I had made (all the Xmas baking!) which was divine but not long after I had sinus probs and felt yuk. So I know for sure now that I'm best sticking to the diet.
Even tho I'm HLA B27 negative, I have found I feel a lot better on the LSD. I still eat bananas and dairy as I'm ok on these but avoid all flours, pulses, rice, and potatoes.
To get over the detox reactions you could try dry skin brushing prior to having a bath with Epsom salts and essential oils, and drinking lots of water.
Plum