Maybe mute all game sound and have one team member on Skype? Voice call or video call, if you can see their face it's a hell of a lot easier to see what's going on, or just having one voice to discern from the rabble. My issue was the opposite, I was very ill for a long time and couldn't speak at all. I could hear what the team were saying but I couldn't communicate the basic things, so I ended up using im on Skype to say things to one person who told the rest. If you happen to be ps4 you're more than welcome to join me and my clan on a raid. We aren't pro raiders just banging through trying to get the quickest time, but we do have the goal!