Firstly, you should stop breastfeeding
for two reasons- one- the child on your feed is going to become ill-nourished and two- the baby you are carrying is going to get problems. Your tremors are probably due to nutritional deficiency
and if they do not subside with proper nutrition and rest, I advice you to see a neurologist
for opinion. You can take vitamin supplements. Please take further advice from your doctor. Good luck.