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1. because you worked in 110+ weather causing
excessive sweating [Non-renal loss] which is one cause of low potassium, likewise check for Magnesium values also.
2. The manifestation of hypokalemia are mainly neuromuscular and cardiac.
3. Take Oral potassium supplements and potassium rich diet: banana,papaya, cheese,tomato,soyabean,coconut water,fruit juices,spinach,potato, chocolates, leafy vegetables.
PS: Electrolyte abnormalities do not typically cause
difficulty breathing, sometimes very low calcium/low magnesium/low phosphate levels can be associated with
muscle weakness which could affect the diaphragm causing
shortness of breath and prickling sensation in chest.