Kechari Mudhra and Manipura Chakra

Hi Friends

I have started Practicing Kechari mudra starting last week. I was able to touch my little tongue by folding my normal tongue.
But the problem is whenever I do kechari, I feel a tightness(pulling upwards) in my Manipura Chara and little bit of pain in my heart.
I lose the groundedness and peacefulness.

Is there any direct impact on Manipura chakra while doing Kecharai?
If yes, is it natural to have tightness in manipura for a beginer?
If not please suggest me the right way. Thank you