too much weight gain :(

So I only gained 2 lbs at 15 weeks. I already am overweight so I was happy with slowly putting on the weight.... then I went to appointment today at 22/23 weeks and have gained 16 pounds!!!!!!!! My doc said I am way above where I should be at this point, but that sometimes people gain quite a bit at 20 weeks and then platue. She said to just watch what I eat but that she isn't worried about it. I've been in tears. I'm not eating wonderful so I know that can be an issue, and I cannot get myself to exercise because my nerve pain and the LACK OF ENERGY EVERY DAY! Ugh.. I could scream. I feel paralyzed.