How Serious Is A Worm Infestation If Its Causing Dizziness

How serious is a worm infestation if its causing dizziness and loss of appetite I went to the doctor who could not say whats wrong with me he just gave medication for the symptoms and said I was ok but I tested my pressure and started using blood builders since it was low and I was feeling dizzy. I researched the symptoms of a worm infestation and I realised I had many of the symptoms I drank the single dose albenzadole 400mg. I felt much better hours after but I just want to know if that is enough to cure me or should I go back to the doctor for more medication.