Marty89, you're not alone mate. It's rough. I could be watching a movie at home, loving it, not thinking of anything bar the movie, and I start getting that lump in my throat, that then turns into the need to take deeper breaths.
5 Minutes later, I find that it has all disappeared without me knowing, until I realise that it has gone, and then it returns. Strange how the noggin works hey. It's frustrating, and so debilitating at times.
As people have said before, you're not alone man! I know how good it is to realise that you're not the ONLY one suffering. I think one of my worst thoughts was sitting, walking, being in a public place; gym, traffic, shops, etc, and thinking that I'm THE only one dealing with this right now. I now think that the bloke or woman that walked past me 2 minutes ago, might be going through the exact same thing, having the same thought.
Like you, I'm not much of a talker and prefer to be the one that provides the shoulder to lean on. My first sessions with my councilor seemed pointless, and I was angry, and frustrated with myself. It's getting better though, I'm now on my 4th session, and feel as though I'm making some progress.
You're not alone mate! Hope things start looking up for you!