I have to agree with the doctor if he gave you good meds..you should be clear of most parasites...you were lucky that the doc gave them to you..my doc like many will not give me meds unless stool test is positive...
kind of sounds like you need to start taking something that will help you absord more nutrients from you foods.. maybe try eating a good organic yogurt once a week for the healthy bacteria... dont over do it as this stuff could be bad for you if you eat too much!!
Also maybe try taking a good supplement like Bromelain (if I spelled that right) it will help you absorb protein...
These can def help wityh fatigue but also maybe try drinking an energy drink everyday..not all at once but small amounts all day..this helped me with fatigue greatly..
Also try ordering Zymex II which will digest the parasites in your intestines!