Hi Vignesh,welcome to AYP!
It’s wonderful you found a practice that makes you feel better.
When you feel ready, it would be good to add meditation to SBP. It’s fine to practice SBP on its own for a little while and it can be very good at balancing the energy. In the long run however it’s best combined with meditation. Lesson 43 explains why.
Best wishes 
I’m a newbie to this and definitely no expert - but I had a Kundalini awakening experience last year and have been working through some pretty serious physical issues both before and after. Nothing as intense as what the guy you are working with is suffering but still quite debilitating both before the experience and the big fall off after my intense experience subsided.
I strongly second what Jean has listed above. This site has helped me immensely to get energy and strength back. Following some of the dietary and supplement recommendations has really helped me in my progress.
I found following the process to strengthen my intestinal lining with L-Glutamine supplementation really helped with Brain fog, Chronic Fatigue type symptoms. Then working on some herbs to assist with adrenal function which seems to be overloaded by Kundalini. Adaptogen herbs like Ashwagandha, Licorice Root plus Kelp. Then some others to increase my Nitric Oxide levels (L-arginine, citrulline, maritime pine bark extract) Plus some others to help with vital energy and blood flow and inflammation (Ginseng, Long Jack, Fish oil).
Aside from this in my most intense come down stage I found I simply had to be outdoors in nature. At one stage I resorted to camping in my back yard as I simply couldn’t stand to be indoors. If the man you are working with is too weak to walk and do outdoor activities I would advise something like this or simply spending long periods lying on the grass in the forest or on the sand at the beach etc.
Hi Vignesh,
I had majority of the symptoms listed by you. So, i would like to share my thought about the problem (Mostly based on self-analysis from ayurvedhic point of view).
First thing is I doubt this is symptom of kundalini awakening. What I understand from the list of symptom is it is something related to Vatha imbalance in your body.
For example:
*Abdominal bolting ( could be due to poor vatha, vatha dosha increase pitha as well. this is the cause for your occasional acid reflex.
*Very dried and mildly swollen nasal cavity. Occasionally, there are traces of blood when i clean my nose. Could be due to sinus (it is form allergy which is again related Vatha imbalance. In fact I have exactly same problem)
- Hair loss and premature greying, Boils forming on the scalp are due to dryness (because of vatha dosha). People with dryness in body will experience static (for instance when you get out of car, as your shoes will rub your shoes against mat on car while driving)
*Constipation is again caused by vatha dosha. Might be your 4th point is due to gas bolting. You will feel like frequently urinating.
*Rest (majority) of the problems are all related to Vatha dosha, for instance mental restlessness is nature of vatha (Vatha is keeps moving so people with vatha dosha will feel restlessness)
So this I don’t think you need to worry about kundalini awakening now.
I would say, you can try from this prospective as well.
As a general guidance grounding activity, food, rest will help balance vatha dosha. That’s why you felt relived after SBM.
Abdominal breathing (belly breathing), life style change should also help you a lot.
Hope this helps.
Wish you speedy recovery.