<s>[INST] I have been prescribed dioxin for my CHF. I have been on it for a couple of years. For the last three four months I have felt very poor - pressure on my chest, hard to breathe at time and feeling very very poorly. Could my dioxin be a possible cause? [/INST] Hello, I think all your symptoms are related to possible aggravation of CHF, and not related to digoxin use.  You should get further re-checked your cardiovascular system to rule out the possible aggravation of the disease. You might require some changes in your treatment plan. Discuss this further with your caring doctor. Hope I have answered your query. Let me know if I can assist you further. Take care Chat Doctor.  </s>