I'm 16 and can completely understand where you are coming from. I have a fear of contamination and especially drug contamination. I was put on medication (which is ironic I know) for anxiety, OCD and depression, it made me feel a little better but stopped working as well as it had before so I let my doctor know and they started me on different medication.

I've now been on my new medication for a while now and I feel as though it has helped me push through and come out victorious (obviously medication isn't going to instantly get rid of OCD as it all depends on your willpower).

As for the zombie feeling I myself have had times of feeling flat, but what you need to remember is that everyone reacts differently and that if it doesn't feel right for you, you can always talk to your doctors or therapist.

And in regards to addiction I have had the exact same worry (addiction runs in my family) but the doctors should be able to help with these thoughts and can stop it in a safe way if need be.

Just remember that these thoughts are exactly that, thoughts. These thoughts are reality.

I wish you all the best and believe that you will also emerge victorious.