U have not mentioned about your age, which is also crucial in decision making. any way lasik is ideal for those cases where power of the eye remains constant (should not vary constantly). frequent change in D power is in fact contra-indication for lasik surgery...in your case frequent changes of glasses is mentioned hence take second opinion
before going for surgery. with regard surgery, generally it is safer procedure with less side effects (provided done by expert), power wont become completely zero, but will help immensely to normalize vision with out the help of glasses.. u can also try for contact lenses.. take care...bye..