Years ago I would feel weak and ill for a week or longer after LFs and as I did more flushes and cleansing this became less of a problem. Sometimes my electrolytes would become unbalanced and I would drink water with a little salt and potassium chloride until I felt stronger. There are sports drinks and balanced electrolytes suppplements available. Between flushes I would do kidney cleanses and use liver support herbs. I did several parasite programs and stayed on a maintenance parasite program weekly. From the way you describe your breathing problems it is possible you have a low Vit B12. Have the lab test for B12 and folic acid. There are sub-lingual tablets with 1000 mg B12, Vit B6 and Folic Acid. If you have low stomach acids you may be helped by taking acid supplements with meals.