OK...sounds like you are giving up here...don't. Slow down, and calculate.
Let's start here:
1) You say your tests are normal. What is normal? Please give the specific readings for ammonia, nitrite, nitrate, pH, alkalinity, specific gravity of water, temperature, etc.
2) What was the medication you added to the tank?
3) What kind of circulation, filtration, etc., do you have running?
Take it one step at a time. There is obviously something going on in your tank. But don't throw in the towel. Let's try to figure out exactly what the problem is. Then you will be better informed on what action to take.
I know it is frustrating.