My boyfriend has been taking an enhancement pill but we arent having .?

For the past few mornings before he goes to work, my boyfriend has been taking a male performance enhancement pill that is supposed to make his harder and last longer. ( he keeps the pills in his drawer and didnt tell me he started taking them )The problem is when i try to make love to him, he is to tired, has a headache or his back hurts. Yet, he watches when i am not around and masturbates. My feelings are hurt and he tell me that i am being stupid and insecure. Am I? Would this bother anyone else?