I know what you mean. I had the same problem, but I wasn't about to quit. My comp was down, I had 10% health, all my strong attacks were cooling down.
Thankfully I had a medpac and I force dashed->telekinetic throwed at him along with mind snap.
He is a tough boss, but a rewarding one to beat (at least personally) for an end of Act 1 Boss.
As a Seer, I made sure to start off the fight (after dying once) with froce shield already casted and the Force Imbalance almost gone (to make sure I could force shield Qyzen again quickly. After that, I made sure to stick to canceling his moves and using Telekinetic throw, letting Qyzen deal the damage.
After he had got down enough, however, Qyzen was taking too much damage and eventually died.
The rest, is history.