Kadisiye said:
slight pain in my left arm after kundalini. Is that normal?
Do you do every day this breathing excercise?:
Alternate Nostril [Sun/Moon] Breathing [Anuloma Viloma]
https://www.satanisgod.org/www.angelfire.com/empire/serpentis666/Alternate_Nostril.html
The perfect path as far as I know for the kundalini is from the base to crown chakra then back. Pain or heat does normaly show resistance (blocked chakras) on the way for the kundalini to rise, it could also be that you are not used to the increased chi/bioelectricity or somehow your arm is more sensibel for energy.
Kunda + hatha yoga + breathing excercises along with physical body training, + daily cleaning returning curses 1+2 should fix most problems.