Just returned today from my 6-month checkup after esophageal surgery & saw your message. This is my impression:
Loosing 35-40+ lbs. is not unusual. Getting back to "normal" isn't usual. Expect a new "normal" in 1-1.5 yrs after surgery, maybe 20-30lbs less. What matters more is energy level and stopping weight loss. Avoid high sugar foods, milk products with lactose (lactose-free milk & ice cream are available at local stores) and VOLUME. Eat very slowly, chew until it's almost liquid and eat 8-10ozs. I've had no trouble with cheese, which, along with apple sauce, has helped me avoid prolonged diarrhea. Dumping weekly may subside after 1 yr. I'm trying some supplements advertised to help repair compromised GI tracts such as L-Glutimine, Juven, Peptamen.
Hope this will help for now.