Congratulate that you get over it in such an early stage.
1) Did you have any symptom prior to the surgery such as feeling cold? What other symptoms did you experience?
2) After surgery, u shouldn't feel cold ( such as cold feet or hand). If you still experience same, I would try to find out if there is any other reasons. What is your TSH? Check your Thyroid too.
3) You need to walk 1-2 hours a day. Get as much sun exposure as you can. You are lucky to be in California.
4) Try aloe vera drink and ginger root to see if it improves your digestion. You may want to take pancrelipase ( Viokase or Creon ) or plant base enzyme to see if it improve bowel condition.
5) What is your Cholesterol, HDL and LDL. There is study showing relation about the gastric cancer lymph node.
6) Google Budwig ( Flaxseed with cottage cheese) on the web. Try it and see it help.
Keep on doing research on the web to avoid recurrence. It is a long term project to fight the recurrence.