I have almost the same problem. Initially I though muscle near my chest is vibrating.
I get up in the night. The moment I get up, fluttering gradually vanishes and gas comes out.
I have been facing this problem for quite some time. I may try gasX and see what happens.
I think the best solution for this is to have early light dinner, lots of water and out door
activity...I am going to try the same..Pl. let me know if you find any solution to this problem.