my voice comes and goes when it wants to?

hi im 30 but always since i can remember i've had problems with my vocal cords i do talk a lot and i thought it was because of that but now that i am older i am not the chatter box i used to be but my voice still comes and goes when it wants to. i can be in a party or laying on my couch, there is NO pain just frustration i feel if i squezze or push my vocal cords the sound of my voice will come out again, sometimes it does work by the way, also was recently told i have a tyroid problem but apparently its not it. Anyone out there maybe experience something similar,what should i do, maybe an ultrasound of my cords to see if its the box or the cords itself? help, any dr that specialize in throat.
thanks