Whenever i recite waheguru simran, i start feeling freshness or calmness at the bottom end of my tongue, basically where the neck starts. Why?
Please listen to Guru's Shabad with full attention, as nothing else will avail you in the end time. Only Guru's shabad will go with you, and none of these other tricks or tastes are of any use. Please consider this shabad thoughtfully, from Anand Sahib. Guru Sahib says:
ey rsnw qU An ris rwic rhI qyrI ipAws n jwie ]
ay rasnaa too an ras raach rahee tayree pi-aas na jaa-ay.
O my tongue, you are engrossed in other tastes, but your thirsty desire is not quenched.
ipAws n jwie horqu ikqY ijcru hir rsu plY n pwie ]
pi-aas na jaa-ay horat kitai jichar har ras palai na paa-ay.
Your thirst shall not be quenched by any means, until you attain the subtle essence of the Lord.
hir rsu pwie plY pIAY hir rsu bhuiV n iqRsnw lwgY Awie ]
har ras paa-ay palai pee-ai har ras bahurh na tarisnaa laagai aa-ay.
If you do obtain the subtle essence of the Lord, and drink in this essence of the Lord, you shall not be troubled by desire again.
eyhu hir rsu krmI pweIAY siqguru imlY ijsu Awie ]
ayhu har ras karmee paa-ee-ai satgur milai jis aa-ay.
This subtle essence of the Lord is obtained by good karma, when one comes to meet with the True Guru.
khY nwnku hoir An rs siB vIsry jw hir vsY min Awie ]32]
kahai naanak hor an ras sabh veesray jaa har vasai man aa-ay. ||32||
Says Nanak, all other tastes and essences are forgotten, when the Lord comes to dwell within the mind. ||32||