I also am a terrible chocoholic, but high quality dark chocolate can contain less than 4 grams of sugar per serving. I save my sugar expenditure on dark chocolate daily. I don't even like sweet milk chocolate anymore! Limiting sugar gets easier as time goes on. I hope someone is doing a thyroid panel with the high TSH as Hypothyroidism is possible. Hypothyroidism is a side effect of some immunotherapies and one symptom is weight gain. My husband is permanently hypothyroid as a result of Pembrolizumab and his TSH and T4 are still erratic even on levothyroxine supplement daily. The oncologist keeps adjusting the dose. I am ready for him to see an endocrinologist instead of just monitoring with the oncologist. I have been hypothyroid for many many years but very stable on levothyroxine despite all the cancer treatments. Good luck and treat yourself to some dark Ghiradelli .....you deserve it!