I had this when I was still feeding DD1 and was pregnant with DD2.. It got to the point that I really didnt want to breastfeed her because it was so bad, I would feed her to sleep, leave the room and head straight for the bathroom.
It did start to get better once my general morning sickness started to go away, but also DD1 weaned herself when I was about 5-6 months pregnant.

Fingercrossed it gets better for you soon!

And btw, when it was really bad for me, I actually had an exit plan when I was feeding in case it wouldnt wait til DD1 was finished and I could make it to the bathroom! Worse still, I actually had to use my emergency exit a fair few times!