For the last week or so towards the evening time mainly around dusk I get this feeling that something stuck in my throat at first it makes me want to clear my throat then I'm constantly clearing my throat then I feel like I have Hawk something but nothing comes out nothing is there and it's disgusting that I'm constantly sounding like I'm spitting a loogie then it gets to the point to where I start coughing and gagging and it's getting to a point now where it's causing anxiety and I start to panic but I don't feel bad I don't feel sick I'm not running a fever I feel completely healthy I don't know what's causing it but it's really starting to get to me and wear me down I'm having a hard time falling asleep because of it but when I wake up the next morning everything's fine and then the next day when evening time comes it starts again what could this be